diff --git a/src/main/scala/org/broadinstitute/dsde/firecloud/FireCloudConfig.scala b/src/main/scala/org/broadinstitute/dsde/firecloud/FireCloudConfig.scala
index 4033a9de9..e78494efb 100644
--- a/src/main/scala/org/broadinstitute/dsde/firecloud/FireCloudConfig.scala
+++ b/src/main/scala/org/broadinstitute/dsde/firecloud/FireCloudConfig.scala
@@ -192,8 +192,10 @@ object FireCloudConfig {
         val config = configObject.toConfig
         val rawlsGroup = config.getString("rawlsGroup")
         val fileName = config.getString("fileName")
+        val phsId = config.getString("phsId")
+        val consentGroup = config.getString("consentGroup")
 
-        NihAllowlist(name, WorkbenchGroupName(rawlsGroup), fileName)
+        NihAllowlist(name, WorkbenchGroupName(rawlsGroup), fileName, DbGapPermission(PhsId(phsId), ConsentGroup(consentGroup)))
       }
     }.toSet
     val enabled = nih.optionalBoolean("enabled").getOrElse(true)
diff --git a/src/main/scala/org/broadinstitute/dsde/firecloud/service/NihService.scala b/src/main/scala/org/broadinstitute/dsde/firecloud/service/NihService.scala
index e48b322a5..9948f11c5 100644
--- a/src/main/scala/org/broadinstitute/dsde/firecloud/service/NihService.scala
+++ b/src/main/scala/org/broadinstitute/dsde/firecloud/service/NihService.scala
@@ -45,7 +45,7 @@ case class NihStatus(linkedNihUsername: Option[String] = None,
                      linkExpireTime: Option[Long] = None
 )
 
-case class NihAllowlist(name: String, groupToSync: WorkbenchGroupName, fileName: String)
+case class NihAllowlist(name: String, groupToSync: WorkbenchGroupName, fileName: String, dbGapPermission: DbGapPermission)
 
 case class NihDatasetPermission(name: String, authorized: Boolean)
 
@@ -252,11 +252,13 @@ class NihService(val samDao: SamDAO,
   // This syncs the specified allowlist in full
   private def syncNihAllowlistAllUsers(nihAllowlist: NihAllowlist): Future[Unit] = {
     val allowlistUsers = downloadNihAllowlist(nihAllowlist)
+    val dbGapSamGroup = FireCloudConfig.Nih.dbGapPermissionToGroup.get(nihAllowlist.dbGapPermission).map(WorkbenchGroupName)
 
     for {
+      samEmails <- Future.traverse(dbGapSamGroup.toList)( samDao.getGroupEmail(_)(getAdminAccessToken))
       ecmEmails <- getNihAllowlistTerraEmailsFromEcm(allowlistUsers)
       thurloeEmails <- getNihAllowlistTerraEmailsFromThurloe(allowlistUsers)
-      members = ecmEmails ++ thurloeEmails
+      members = ecmEmails ++ thurloeEmails ++ samEmails
       _ <- ensureAllowlistGroupsExists()
       // The request to Sam to completely overwrite the group with the list of actively linked users on the allowlist
       _ <- samDao.overwriteGroupMembers(nihAllowlist.groupToSync, ManagedGroupRoles.Member, members.toList)(
diff --git a/src/test/resources/reference.conf b/src/test/resources/reference.conf
index adcbde81f..27ac1d289 100644
--- a/src/test/resources/reference.conf
+++ b/src/test/resources/reference.conf
@@ -63,15 +63,21 @@ nih {
   whitelists = {
     "TARGET" {
       "fileName":"target-whitelist.txt",
-      "rawlsGroup":"TARGET-dbGaP-Authorized"
+      "rawlsGroup":"TARGET-dbGaP-Authorized",
+      "phsId":"phs002410",
+      "consentGroup":"c1"
     },
     "TCGA" {
       "fileName":"tcga-whitelist.txt",
-      "rawlsGroup":"TCGA-dbGaP-Authorized"
+      "rawlsGroup":"TCGA-dbGaP-Authorized",
+      "phsId":"phs002409",
+      "consentGroup":"c1"
     },
     "BROKEN" {
       "fileName":"broken-whitelist.txt",
-      "rawlsGroup":"this-doesnt-matter"
+      "rawlsGroup":"this-doesnt-matter",
+      "phsId":"phs001234",
+      "consentGroup":"c2"
     }
   }
   rasIssuer = "https://stsstg.nih.gov"
diff --git a/src/test/scala/org/broadinstitute/dsde/firecloud/service/NihServiceUnitSpec.scala b/src/test/scala/org/broadinstitute/dsde/firecloud/service/NihServiceUnitSpec.scala
index 9afd0e52d..f19112bd0 100644
--- a/src/test/scala/org/broadinstitute/dsde/firecloud/service/NihServiceUnitSpec.scala
+++ b/src/test/scala/org/broadinstitute/dsde/firecloud/service/NihServiceUnitSpec.scala
@@ -76,6 +76,7 @@ class NihServiceUnitSpec extends AnyFlatSpec with Matchers with BeforeAndAfterEa
   val userTcgaAndTarget = genSamUser();
   val userTcgaOnly = genSamUser();
   val userTargetOnly = genSamUser();
+  val userDbGap = genSamUser();
 
   // DateTimes must be modified in seconds instead of days to match implementation
   val secondsIn30Days = 30.days.toSeconds.toInt
@@ -272,6 +273,54 @@ class NihServiceUnitSpec extends AnyFlatSpec with Matchers with BeforeAndAfterEa
     verifyTargetGroupSynced()
   }
 
+  it should "sync all users by combining dbGap group members with ECM and Thurloe" in {
+    when(ecmDao.getActiveLinkedEraAccounts(ArgumentMatchers.eq(UserInfo(adminAccessToken, ""))))
+      .thenReturn(Future.successful(Seq(userTargetOnlyLinkedAccount)))
+    when(thurloeDao.getAllUserValuesForKey(ArgumentMatchers.eq("linkedNihUsername")))
+      .thenReturn(
+        Future.successful(
+          linkedAccountsBySamUserId
+            .removed(WorkbenchUserId(userTargetOnlyLinkedAccount.userId))
+            .map(tup => (tup._1.value, tup._2.linkedExternalId))
+        )
+      )
+    when(thurloeDao.getAllUserValuesForKey(ArgumentMatchers.eq("linkExpireTime")))
+      .thenReturn(
+        Future.successful(
+          linkedAccountsBySamUserId
+            .removed(WorkbenchUserId(userTargetOnlyLinkedAccount.userId))
+            .map(tup => (tup._1.value, (tup._2.linkExpireTime.getMillis / 1000L).toString))
+        )
+      )
+    when(samDao.getGroupEmail(any())(any())).thenReturn(
+      Future.successful(
+        userDbGap.email
+      )
+    )
+
+    val emailsToSync = Set(userTcgaAndTarget.email, userTargetOnly.email, userDbGap.email)
+    val nihStatus = Await
+      .result(nihService.syncAllowlistAllUsers("TARGET"), Duration.Inf)
+      .asInstanceOf[PerRequest.RequestComplete[StatusCode]]
+      .response
+
+    nihStatus should be(StatusCodes.NoContent)
+    verify(googleDao, never()).getBucketObjectAsInputStream(FireCloudConfig.Nih.whitelistBucket, "tcga-whitelist.txt")
+    verify(googleDao, times(1))
+      .getBucketObjectAsInputStream(FireCloudConfig.Nih.whitelistBucket, "target-whitelist.txt")
+    verify(samDao, times(1)).overwriteGroupMembers(
+      ArgumentMatchers.eq(WorkbenchGroupName("TARGET-dbGaP-Authorized")),
+      ArgumentMatchers.eq(ManagedGroupRoles.Member),
+      ArgumentMatchers.argThat((list: List[WorkbenchEmail]) => list.toSet.equals(emailsToSync))
+    )(ArgumentMatchers.eq(UserInfo(adminAccessToken, "")))
+    verify(samDao, never()).overwriteGroupMembers(
+      ArgumentMatchers.eq(WorkbenchGroupName("other-group")),
+      ArgumentMatchers.eq(ManagedGroupRoles.Member),
+      ArgumentMatchers.argThat((list: List[WorkbenchEmail]) => list.toSet.equals(emailsToSync))
+    )(ArgumentMatchers.eq(UserInfo(adminAccessToken, "")))
+  }
+
+
   it should "respond with NOT FOUND if no allowlist is found" in {
     val nihStatus = Await
       .result(nihService.syncAllowlistAllUsers("NOT_FOUND"), Duration.Inf)