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South Boston cop Billy Costigan goes under cover to infiltrate the organization 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