South Boston cop Billy Costigan goes under cover to infiltrate the organisation of gangland chief Frank Costello. As Billy gains the mobster's trust, a career criminal named Colin Sullivan infiltrates the police department and reports on its activities to his syndicate bosses. When both organizations learn they have a mole in their midst, Billy and Colin must figure out each other's identities to save their own lives.
Starring Leonardo DiCaprio, Matt Damon, Jack Nicholson
Director Martin Scorsese