cave cop
n.— «John Finley 3rd joined the New York City Transit Police in 1990 before it was merged into the NYPD in 1995, in what the old Transit “cave cops” still refer to as a “hostile takeover.” Today, John Finley 3rd works for Highway 2 in Brooklyn, and serves as a union rep.» —“Fire hero’s legacy a family tradition” by Dennis Hamill New York Daily News (New York City) Oct. 19, 2006. (source: Double-Tongued Dictionary)