The Departed 2006

To take down South Boston's Irish Mafia, the police send in one of their own to infiltrate the underworld, not realizing the syndicate has done likewise. While an undercover cop curries favor with the mob kingpin, a career criminal rises through the police ranks. But both sides soon discover there's a mole among them.

Spoilers for The Departed

Submitted by: billview

Mat Damon is the bad guy and a mole, Jack Nicolson is the bad bad guy. Di Caprio is the good guy, and also a mole. In the end they are all killed... BUT Vera Farmiga is very hot in this role and she is not killed.