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.


Cops or criminals. When you’re facing a loaded gun, what’s the difference?
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Leonardo DiCaprio
Billy

Matt Damon
Colin

Jack Nicholson
Costello

Mark Wahlberg
Dignam

Martin Sheen
Queenan

Ray Winstone
Mr. French

Vera Farmiga
Madolyn

Anthony Anderson
Brown

Alec Baldwin
Ellerby
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