Casts:
Matt DamonKristen DaltonRobert WahlbergDavid O'HaraKevin CorriganRay WinstoneJack NicholsonMartin ScorseseJames Badge DaleVera FarmigaAnthony AndersonAlec BaldwinMartin SheenMark WahlbergLeonardo DiCaprioMark Rolston
An undercover cop and a mole in the police attempt to identify each other while infiltrating an Irish gang in South Boston.