public list<CollaborationGroupMember> returnChatterGroupMember(String chatterGroupId)
{
list<CollaborationGroupMember> groupMemberDel;
groupMemberDel = [select Id, MemberId from CollaborationGroupMember where CollaborationGroupId =: chatterGroupId];
return groupMemberDel;
}
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Where chatterGroupId => ID of the associated CollaborationGroup.