diff --git a/common/contract.ts b/common/contract.ts
index b1242ab9..177af862 100644
--- a/common/contract.ts
+++ b/common/contract.ts
@@ -1,6 +1,7 @@
 import { Answer } from './answer'
 import { Fees } from './fees'
 import { JSONContent } from '@tiptap/core'
+import { GroupLink } from 'common/group'
 
 export type AnyMechanism = DPM | CPMM
 export type AnyOutcomeType = Binary | PseudoNumeric | FreeResponse | Numeric
@@ -46,6 +47,7 @@ export type Contract<T extends AnyContractType = AnyContractType> = {
   collectedFees: Fees
 
   groupSlugs?: string[]
+  groupLinks?: GroupLink[]
   uniqueBettorIds?: string[]
   uniqueBettorCount?: number
   popularityScore?: number
diff --git a/common/group.ts b/common/group.ts
index e367ded7..7d3215ae 100644
--- a/common/group.ts
+++ b/common/group.ts
@@ -19,3 +19,11 @@ export const MAX_ABOUT_LENGTH = 140
 export const MAX_ID_LENGTH = 60
 export const NEW_USER_GROUP_SLUGS = ['updates', 'bugs', 'welcome']
 export const GROUP_CHAT_SLUG = 'chat'
+
+export type GroupLink = {
+  slug: string
+  name: string
+  groupId: string
+  createdTime: number
+  userId?: string
+}
diff --git a/firestore.rules b/firestore.rules
index 96378d8b..0f28ca80 100644
--- a/firestore.rules
+++ b/firestore.rules
@@ -74,7 +74,7 @@ service cloud.firestore {
     match /contracts/{contractId} {
       allow read;
       allow update: if request.resource.data.diff(resource.data).affectedKeys()
-                                                                 .hasOnly(['tags', 'lowercaseTags', 'groupSlugs']);
+                                                                 .hasOnly(['tags', 'lowercaseTags', 'groupSlugs', 'groupLinks']);
       allow update: if request.resource.data.diff(resource.data).affectedKeys()
                                                                  .hasOnly(['description', 'closeTime', 'question'])
                        && resource.data.creatorId == request.auth.uid;
diff --git a/functions/src/on-delete-group.ts b/functions/src/on-delete-group.ts
index ca833254..e5531d7b 100644
--- a/functions/src/on-delete-group.ts
+++ b/functions/src/on-delete-group.ts
@@ -3,6 +3,7 @@ import * as admin from 'firebase-admin'
 
 import { Group } from 'common/group'
 import { Contract } from 'common/contract'
+
 const firestore = admin.firestore()
 
 export const onDeleteGroup = functions.firestore
@@ -15,17 +16,21 @@ export const onDeleteGroup = functions.firestore
       .collection('contracts')
       .where('groupSlugs', 'array-contains', group.slug)
       .get()
+    console.log("contracts with group's slug:", contracts)
 
     for (const doc of contracts.docs) {
       const contract = doc.data() as Contract
+      const newGroupLinks = contract.groupLinks?.filter(
+        (link) => link.slug !== group.slug
+      )
+
       // remove the group from the contract
       await firestore
         .collection('contracts')
         .doc(contract.id)
         .update({
-          groupSlugs: (contract.groupSlugs ?? []).filter(
-            (groupSlug) => groupSlug !== group.slug
-          ),
+          groupSlugs: contract.groupSlugs?.filter((s) => s !== group.slug),
+          groupLinks: newGroupLinks ?? [],
         })
     }
   })
diff --git a/functions/src/scripts/convert-categories.ts b/functions/src/scripts/convert-categories.ts
index d559bf92..3436bcbc 100644
--- a/functions/src/scripts/convert-categories.ts
+++ b/functions/src/scripts/convert-categories.ts
@@ -3,7 +3,7 @@ import * as admin from 'firebase-admin'
 import { initAdmin } from './script-init'
 import { getValues, isProd } from '../utils'
 import { CATEGORIES_GROUP_SLUG_POSTFIX } from 'common/categories'
-import { Group } from 'common/group'
+import { Group, GroupLink } from 'common/group'
 import { uniq } from 'lodash'
 import { Contract } from 'common/contract'
 import { User } from 'common/user'
@@ -17,27 +17,6 @@ initAdmin()
 
 const adminFirestore = admin.firestore()
 
-// eslint-disable-next-line @typescript-eslint/no-unused-vars
-const addGroupIdToContracts = async () => {
-  const groups = await getValues<Group>(adminFirestore.collection('groups'))
-  const contracts = await getValues<Contract>(
-    adminFirestore.collection('contracts')
-  )
-  for (const group of groups) {
-    const groupContracts = contracts.filter((contract) =>
-      group.contractIds.includes(contract.id)
-    )
-    for (const contract of groupContracts) {
-      await adminFirestore
-        .collection('contracts')
-        .doc(contract.id)
-        .update({
-          groupSlugs: uniq([...(contract.groupSlugs ?? []), group.slug]),
-        })
-    }
-  }
-}
-
 const convertCategoriesToGroupsInternal = async (categories: string[]) => {
   for (const category of categories) {
     const markets = await getValues<Contract>(
@@ -93,18 +72,30 @@ const convertCategoriesToGroupsInternal = async (categories: string[]) => {
       })
 
     for (const market of markets) {
+      if (market.groupLinks?.map((l) => l.groupId).includes(newGroup.id))
+        continue // already in that group
+
+      const newGroupLinks = [
+        ...(market.groupLinks ?? []),
+        {
+          groupId: newGroup.id,
+          createdTime: Date.now(),
+          slug: newGroup.slug,
+          name: newGroup.name,
+        } as GroupLink,
+      ]
       await adminFirestore
         .collection('contracts')
         .doc(market.id)
         .update({
-          groupSlugs: uniq([...(market?.groupSlugs ?? []), newGroup.slug]),
+          groupSlugs: uniq([...(market.groupSlugs ?? []), newGroup.slug]),
+          groupLinks: newGroupLinks,
         })
     }
   }
 }
 
 async function convertCategoriesToGroups() {
-  // await addGroupIdToContracts()
   // const defaultCategories = Object.values(DEFAULT_CATEGORIES)
   const moreCategories = ['world', 'culture']
   await convertCategoriesToGroupsInternal(moreCategories)
diff --git a/functions/src/scripts/link-contracts-to-groups.ts b/functions/src/scripts/link-contracts-to-groups.ts
new file mode 100644
index 00000000..feda249e
--- /dev/null
+++ b/functions/src/scripts/link-contracts-to-groups.ts
@@ -0,0 +1,52 @@
+import { getValues } from 'functions/src/utils'
+import { Group } from 'common/group'
+import { Contract } from 'common/contract'
+import { initAdmin } from 'functions/src/scripts/script-init'
+import * as admin from 'firebase-admin'
+import { filterDefined } from 'common/util/array'
+import { uniq } from 'lodash'
+
+initAdmin()
+
+const adminFirestore = admin.firestore()
+
+const addGroupIdToContracts = async () => {
+  const groups = await getValues<Group>(adminFirestore.collection('groups'))
+  const contracts = await getValues<Contract>(
+    adminFirestore.collection('contracts')
+  )
+  for (const group of groups) {
+    const groupContracts = contracts.filter((contract) =>
+      group.contractIds.includes(contract.id)
+    )
+    for (const contract of groupContracts) {
+      const oldGroupLinks = contract.groupLinks?.filter(
+        (l) => l.slug != group.slug
+      )
+      const newGroupLinks = filterDefined([
+        ...(oldGroupLinks ?? []),
+        group.id
+          ? {
+              slug: group.slug,
+              name: group.name,
+              groupId: group.id,
+              createdTime: Date.now(),
+            }
+          : undefined,
+      ])
+      await adminFirestore
+        .collection('contracts')
+        .doc(contract.id)
+        .update({
+          groupSlugs: uniq([...(contract.groupSlugs ?? []), group.slug]),
+          groupLinks: newGroupLinks,
+        })
+    }
+  }
+}
+
+if (require.main === module) {
+  addGroupIdToContracts()
+    .then(() => process.exit())
+    .catch(console.log)
+}
diff --git a/web/components/contract/contract-details.tsx b/web/components/contract/contract-details.tsx
index 0f5a1d42..544e9c27 100644
--- a/web/components/contract/contract-details.tsx
+++ b/web/components/contract/contract-details.tsx
@@ -23,11 +23,8 @@ import { useState } from 'react'
 import { ContractInfoDialog } from './contract-info-dialog'
 import { Bet } from 'common/bet'
 import NewContractBadge from '../new-contract-badge'
-import { CATEGORY_LIST } from 'common/categories'
-import { TagsList } from '../tags-list'
 import { UserFollowButton } from '../follow-button'
 import { DAY_MS } from 'common/util/time'
-import { useGroupsWithContract } from 'web/hooks/use-group'
 import { ShareIconButton } from 'web/components/share-icon-button'
 import { useUser } from 'web/hooks/use-user'
 import { Editor } from '@tiptap/react'
@@ -37,6 +34,8 @@ import { Button } from 'web/components/button'
 import { Modal } from 'web/components/layout/modal'
 import { Col } from 'web/components/layout/col'
 import { ContractGroupsList } from 'web/components/groups/contract-groups-list'
+import { SiteLink } from 'web/components/site-link'
+import { groupPath } from 'web/lib/firebase/groups'
 
 export type ShowTime = 'resolve-date' | 'close-date'
 
@@ -50,15 +49,16 @@ export function MiscDetails(props: {
     volume,
     volume24Hours,
     closeTime,
-    tags,
     isResolved,
     createdTime,
     resolutionTime,
+    groupLinks,
   } = contract
+
   // Show at most one category that this contract is tagged by
-  const categories = CATEGORY_LIST.filter((category) =>
-    tags.map((t) => t.toLowerCase()).includes(category)
-  ).slice(0, 1)
+  // const categories = CATEGORY_LIST.filter((category) =>
+  //   tags.map((t) => t.toLowerCase()).includes(category)
+  // ).slice(0, 1)
   const isNew = createdTime > Date.now() - DAY_MS && !isResolved
 
   return (
@@ -80,13 +80,24 @@ export function MiscDetails(props: {
           {fromNow(resolutionTime || 0)}
         </Row>
       ) : volume > 0 || !isNew ? (
-        <Row>{contractPool(contract)} pool</Row>
+        <Row className={'shrink-0'}>{contractPool(contract)} pool</Row>
       ) : (
         <NewContractBadge />
       )}
 
-      {categories.length > 0 && (
-        <TagsList className="text-gray-400" tags={categories} noLabel />
+      {/*{categories.length > 0 && (*/}
+      {/*  <TagsList className="text-gray-400" tags={categories} noLabel />*/}
+      {/*)}*/}
+      {groupLinks && groupLinks.length > 0 && (
+        <SiteLink
+          href={groupPath(groupLinks[0].slug)}
+          className="text-sm text-gray-400"
+        >
+          <Row className={'line-clamp-1 flex-wrap items-center '}>
+            <UserGroupIcon className="mx-1 mb-0.5 inline h-4 w-4 shrink-0" />
+            {groupLinks[0].name}
+          </Row>
+        </SiteLink>
       )}
     </Row>
   )
@@ -134,11 +145,12 @@ export function ContractDetails(props: {
   disabled?: boolean
 }) {
   const { contract, bets, isCreator, disabled } = props
-  const { closeTime, creatorName, creatorUsername, creatorId } = contract
+  const { closeTime, creatorName, creatorUsername, creatorId, groupLinks } =
+    contract
   const { volumeLabel, resolvedDate } = contractMetrics(contract)
 
-  const groups = useGroupsWithContract(contract)
-  const groupToDisplay = groups[0] ?? null
+  const groupToDisplay =
+    groupLinks?.sort((a, b) => a.createdTime - b.createdTime)[0] ?? null
   const user = useUser()
   const [open, setOpen] = useState(false)
 
@@ -172,11 +184,7 @@ export function ContractDetails(props: {
           <Row>
             <UserGroupIcon className="mx-1 inline h-5 w-5 shrink-0" />
             <span className={'line-clamp-1'}>
-              {contract.groupSlugs && !groupToDisplay
-                ? ''
-                : groupToDisplay
-                ? groupToDisplay.name
-                : 'No group'}
+              {groupToDisplay ? groupToDisplay.name : 'No group'}
             </span>
           </Row>
         </Button>
@@ -187,7 +195,11 @@ export function ContractDetails(props: {
             'max-h-[70vh] min-h-[20rem] overflow-auto rounded bg-white p-6'
           }
         >
-          <ContractGroupsList groups={groups} contract={contract} user={user} />
+          <ContractGroupsList
+            groupLinks={groupLinks ?? []}
+            contract={contract}
+            user={user}
+          />
         </Col>
       </Modal>
 
diff --git a/web/components/groups/contract-groups-list.tsx b/web/components/groups/contract-groups-list.tsx
index 7fab42d8..423cbb97 100644
--- a/web/components/groups/contract-groups-list.tsx
+++ b/web/components/groups/contract-groups-list.tsx
@@ -1,8 +1,7 @@
-import { Group } from 'common/group'
 import { Col } from 'web/components/layout/col'
 import { Row } from 'web/components/layout/row'
 import clsx from 'clsx'
-import { GroupLink } from 'web/pages/groups'
+import { GroupLinkItem } from 'web/pages/groups'
 import { XIcon } from '@heroicons/react/outline'
 import { Button } from 'web/components/button'
 import { GroupSelector } from 'web/components/groups/group-selector'
@@ -13,14 +12,16 @@ import {
 import { User } from 'common/user'
 import { Contract } from 'common/contract'
 import { SiteLink } from 'web/components/site-link'
+import { GroupLink } from 'common/group'
+import { useGroupsWithContract } from 'web/hooks/use-group'
 
 export function ContractGroupsList(props: {
-  groups: Group[]
+  groupLinks: GroupLink[]
   contract: Contract
   user: User | null | undefined
 }) {
-  const { groups, user, contract } = props
-
+  const { groupLinks, user, contract } = props
+  const groups = useGroupsWithContract(contract)
   return (
     <Col className={'gap-2'}>
       <span className={'text-xl text-indigo-700'}>
@@ -33,10 +34,10 @@ export function ContractGroupsList(props: {
             options={{
               showSelector: true,
               showLabel: false,
-              ignoreGroupIds: groups.map((g) => g.id),
+              ignoreGroupIds: groupLinks.map((g) => g.groupId),
             }}
             setSelectedGroup={(group) =>
-              group && addContractToGroup(group, contract)
+              group && addContractToGroup(group, contract, user.id)
             }
             selectedGroup={undefined}
             creator={user}
@@ -54,7 +55,7 @@ export function ContractGroupsList(props: {
           className={clsx('items-center justify-between gap-2 p-2')}
         >
           <Row className="line-clamp-1 items-center gap-2">
-            <GroupLink group={group} />
+            <GroupLinkItem group={group} />
           </Row>
           {user && group.memberIds.includes(user.id) && (
             <Button
diff --git a/web/components/groups/groups-button.tsx b/web/components/groups/groups-button.tsx
index 39c75d40..bb94c9ed 100644
--- a/web/components/groups/groups-button.tsx
+++ b/web/components/groups/groups-button.tsx
@@ -11,7 +11,7 @@ import { Modal } from 'web/components/layout/modal'
 import { Col } from 'web/components/layout/col'
 import { joinGroup, leaveGroup } from 'web/lib/firebase/groups'
 import { firebaseLogin } from 'web/lib/firebase/users'
-import { GroupLink } from 'web/pages/groups'
+import { GroupLinkItem } from 'web/pages/groups'
 import toast from 'react-hot-toast'
 
 export function GroupsButton(props: { user: User }) {
@@ -77,7 +77,7 @@ function GroupItem(props: { group: Group; className?: string }) {
   return (
     <Row className={clsx('items-center justify-between gap-2 p-2', className)}>
       <Row className="line-clamp-1 items-center gap-2">
-        <GroupLink group={group} />
+        <GroupLinkItem group={group} />
       </Row>
       <JoinOrLeaveGroupButton group={group} />
     </Row>
diff --git a/web/lib/firebase/contracts.ts b/web/lib/firebase/contracts.ts
index 63efa53b..14594803 100644
--- a/web/lib/firebase/contracts.ts
+++ b/web/lib/firebase/contracts.ts
@@ -1,17 +1,17 @@
 import dayjs from 'dayjs'
 import {
-  doc,
-  setDoc,
-  deleteDoc,
-  where,
   collection,
-  query,
-  getDocs,
-  orderBy,
+  deleteDoc,
+  doc,
   getDoc,
-  updateDoc,
+  getDocs,
   limit,
+  orderBy,
+  query,
+  setDoc,
   startAfter,
+  updateDoc,
+  where,
 } from 'firebase/firestore'
 import { sortBy, sum } from 'lodash'
 
@@ -129,6 +129,7 @@ export async function listContractsByGroupSlug(
 ): Promise<Contract[]> {
   const q = query(contracts, where('groupSlugs', 'array-contains', slug))
   const snapshot = await getDocs(q)
+  console.log(snapshot.docs.map((doc) => doc.data()))
   return snapshot.docs.map((doc) => doc.data())
 }
 
diff --git a/web/lib/firebase/groups.ts b/web/lib/firebase/groups.ts
index dc096f4e..151e7fa1 100644
--- a/web/lib/firebase/groups.ts
+++ b/web/lib/firebase/groups.ts
@@ -7,7 +7,7 @@ import {
   where,
 } from 'firebase/firestore'
 import { sortBy, uniq } from 'lodash'
-import { Group, GROUP_CHAT_SLUG } from 'common/group'
+import { Group, GROUP_CHAT_SLUG, GroupLink } from 'common/group'
 import { updateContract } from './contracts'
 import {
   coll,
@@ -124,9 +124,27 @@ export async function leaveGroup(group: Group, userId: string): Promise<void> {
   return await updateGroup(group, { memberIds: uniq(newMemberIds) })
 }
 
-export async function addContractToGroup(group: Group, contract: Contract) {
+export async function addContractToGroup(
+  group: Group,
+  contract: Contract,
+  userId: string
+) {
+  if (contract.groupLinks?.map((l) => l.groupId).includes(group.id)) return // already in that group
+
+  const newGroupLinks = [
+    ...(contract.groupLinks ?? []),
+    {
+      groupId: group.id,
+      createdTime: Date.now(),
+      slug: group.slug,
+      userId,
+      name: group.name,
+    } as GroupLink,
+  ]
+
   await updateContract(contract.id, {
-    groupSlugs: [...(contract.groupSlugs ?? []), group.slug],
+    groupSlugs: uniq([...(contract.groupSlugs ?? []), group.slug]),
+    groupLinks: newGroupLinks,
   })
   return await updateGroup(group, {
     contractIds: uniq([...group.contractIds, contract.id]),
@@ -142,11 +160,15 @@ export async function removeContractFromGroup(
   group: Group,
   contract: Contract
 ) {
-  const newGroupSlugs = contract.groupSlugs?.filter(
-    (slug) => slug !== group.slug
+  if (!contract.groupLinks?.map((l) => l.groupId).includes(group.id)) return // not in that group
+
+  const newGroupLinks = contract.groupLinks?.filter(
+    (link) => link.slug !== group.slug
   )
   await updateContract(contract.id, {
-    groupSlugs: uniq(newGroupSlugs ?? []),
+    groupSlugs:
+      contract.groupSlugs?.filter((slug) => slug !== group.slug) ?? [],
+    groupLinks: newGroupLinks ?? [],
   })
   const newContractIds = group.contractIds.filter((id) => id !== contract.id)
   return await updateGroup(group, {
@@ -159,8 +181,22 @@ export async function removeContractFromGroup(
     })
 }
 
-export async function setContractGroupSlugs(group: Group, contractId: string) {
-  await updateContract(contractId, { groupSlugs: [group.slug] })
+export async function setContractGroupLinks(
+  group: Group,
+  contractId: string,
+  userId: string
+) {
+  await updateContract(contractId, {
+    groupLinks: [
+      {
+        groupId: group.id,
+        name: group.name,
+        slug: group.slug,
+        userId,
+        createdTime: Date.now(),
+      } as GroupLink,
+    ],
+  })
   return await updateGroup(group, {
     contractIds: uniq([...group.contractIds, contractId]),
   })
diff --git a/web/pages/create.tsx b/web/pages/create.tsx
index 9fa340f5..ec86a277 100644
--- a/web/pages/create.tsx
+++ b/web/pages/create.tsx
@@ -19,7 +19,7 @@ import {
 import { formatMoney } from 'common/util/format'
 import { removeUndefinedProps } from 'common/util/object'
 import { ChoicesToggleGroup } from 'web/components/choices-toggle-group'
-import { getGroup, setContractGroupSlugs } from 'web/lib/firebase/groups'
+import { getGroup, setContractGroupLinks } from 'web/lib/firebase/groups'
 import { Group } from 'common/group'
 import { useTracking } from 'web/hooks/use-tracking'
 import { useWarnUnsavedChanges } from 'web/hooks/use-warn-unsaved-changes'
@@ -226,7 +226,7 @@ export function NewContract(props: {
         isFree: false,
       })
       if (result && selectedGroup) {
-        await setContractGroupSlugs(selectedGroup, result.id)
+        await setContractGroupLinks(selectedGroup, result.id, creator.id)
       }
 
       await router.push(contractPath(result as Contract))
diff --git a/web/pages/group/[...slugs]/index.tsx b/web/pages/group/[...slugs]/index.tsx
index c27d998e..eebf0619 100644
--- a/web/pages/group/[...slugs]/index.tsx
+++ b/web/pages/group/[...slugs]/index.tsx
@@ -1,4 +1,4 @@
-import { take, sortBy, debounce } from 'lodash'
+import { debounce, sortBy, take } from 'lodash'
 import PlusSmIcon from '@heroicons/react/solid/PlusSmIcon'
 
 import { Group, GROUP_CHAT_SLUG } from 'common/group'
@@ -6,11 +6,11 @@ import { Page } from 'web/components/page'
 import { listAllBets } from 'web/lib/firebase/bets'
 import { Contract, listContractsByGroupSlug } from 'web/lib/firebase/contracts'
 import {
-  groupPath,
-  getGroupBySlug,
-  updateGroup,
-  joinGroup,
   addContractToGroup,
+  getGroupBySlug,
+  groupPath,
+  joinGroup,
+  updateGroup,
 } from 'web/lib/firebase/groups'
 import { Row } from 'web/components/layout/row'
 import { UserLink } from 'web/components/user-page'
@@ -543,7 +543,7 @@ function AddContractButton(props: { group: Group; user: User }) {
   const [open, setOpen] = useState(false)
 
   async function addContractToCurrentGroup(contract: Contract) {
-    await addContractToGroup(group, contract)
+    await addContractToGroup(group, contract, user.id)
     setOpen(false)
   }
 
diff --git a/web/pages/groups.tsx b/web/pages/groups.tsx
index d1eed970..521742b2 100644
--- a/web/pages/groups.tsx
+++ b/web/pages/groups.tsx
@@ -1,4 +1,4 @@
-import { sortBy, debounce } from 'lodash'
+import { debounce, sortBy } from 'lodash'
 import Link from 'next/link'
 import React, { useEffect, useState } from 'react'
 import { Group } from 'common/group'
@@ -238,7 +238,7 @@ function GroupMembersList(props: { group: Group }) {
   )
 }
 
-export function GroupLink(props: { group: Group; className?: string }) {
+export function GroupLinkItem(props: { group: Group; className?: string }) {
   const { group, className } = props
 
   return (