

Cops or criminals. When you’re facing a loaded gun, what’s the difference?
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.
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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
Leonardo DiCaprio Compilation
Featurette · YouTube
Dignam Gets Revenge
Clip · YouTube
Billy Confronts Colin
Clip · YouTube
The Fallout
Clip · YouTube
4K Ultra HD Extended Preview
Clip · YouTube
4K Ultra HD Official Trailer
Trailer · YouTube