Los Angeles County Sheriff’s deputies are forming a new “gang” in the agency’s East L. A new group can also form because a dominant group is so exclusionary that uninvited deputies form their own, because the leader — or “shot-caller” — of a group leaves the station, or because a group simply has gotten too big, Peterson said. Weeks after he unseated Villanueva in the November elections, now-Sheriff Robert Luna signaled his intent to handle the groups differently — starting by acknowledging their presence