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.

Jack Nicholson,Leonardo DiCaprio,Matt Damon,Mark Wahlberg,Vera Farmiga,Martin Sheen,Ray Winstone,Anthony Anderson,Alec Baldwin,Kevin Corrigan,James Badge Dale,David O'Hara,Robert Wahlberg,Kristen Dalton,Thomas B. Duffy,Richard Hughes,Chance Kelly,Larry Mitchell,Mark Rolston,J. C. MacKenzie,Mary Klug,Robert 'Toshi' Kar Yuen Chan,Peg Holzemer,Gurdeep Singh,Armen Garo,John Cenatiempo,Brian Smyj,William Severs,Douglas Crosby,Dorothy Lyman,Audrie Neenan,Conor Donovan,Patrick Coppola,Mick O'Rourke,Nellie Sciutto,Henry Yuk,John Rue,Joseph P. Reidy,John Farrer,Billy Smith,Brian Haley,Terry Serpico,Jay Giannone,David Conley,Tracey Paleo,Jill Brown,Tom Kemp,Kevin P. McCarthy,Chris Fischer,Joseph Riccobene,Johnny Cicco,Lyman Chen,Shay Duffin,David Fischer,Emma Tillinger Koskoff,Craig 'Radioman' Castaldo,Francesca Scorsese,Dennis Lynch,Michael Byron,Takumi Bando,Eric Bruno Borgman,Brendan Burke,Chris Chinn,Jeffrey Corazzini,Jim Ford,Trudi Goodman,Steve Lord,Jack McCullough,Osmani Rodriguez,Lawrence Cameron Steele,Conor Timmis,Joseph Oliveira,Adam Masnyk,John Franchi,Paul McGillicuddy,Kim Carrell,Rebecca Love,Sarah Fearon

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