Synopsis
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.
Cast

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

Kevin Corrigan
Cousin Sean

James Badge Dale
Barrigan

David O'Hara
Fitzy

Mark Rolston
Delahunt
Robert Wahlberg
Lazio (FBI)

Kristen Dalton
Gwen
Thomas B. Duffy
Govenor
Richard Hughes
Uncle Edward

J.C. MacKenzie
Realtor
Mary Klug
Billy's Aunt

Peg Holzemer
Mrs. Kennefick

Robert 'Toshi' Kar Yuen Chan
Triad Boss

Gurdeep Singh
Pakistani Proprietor

Armen Garo
Providence Gangster #1

John Cenatiempo
Providence Gangster #2
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