South Boston cop Billy Costigan (Leonardo DiCaprio) works undercover to infiltrate boss Frank Costello's (Jack Nicholson) gang organization. As Billy gains the gangster's trust, a career criminal named Colin Sullivan (Matt Damon) infiltrates the police and reports their activities to his syndicate bosses. When both organizations discover they have an enemy in their ranks, Billy and Colin must uncover their identities.
Story added by crowbus940 on April 26, 2023
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