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.
Billy
Colin
Costello
Dignam
Queenan
Mr. French
Madolyn
Brown
Ellerby
Cousin Sean
Barrigan
Fitzy
Delahunt
Lazio (FBI)
Gwen
Govenor
Uncle Edward
Realtor
Billy's Aunt
Mrs. Kennefick
Triad Boss
Pakistani Proprietor
Providence Gangster #1
Providence Gangster #2
Kneecapped Bankrobber
Detective #1 Tailing Queenan
Translator
Detective #1 - Colin's Unit
Detective #2 - Colin's Unit
Man Glassed in Bar
Older Priest
Younger Priest
Police Camera Tech
Police Cell Phone Tech
Darlene the Secretary
Man Killed by French
Woman at Bar #1
Woman at Bar #2
News Anchor
Billy's Mother
Young Colin
Carmen
Woman at Opera
Bookie Harassed by French
Jimmy Bags
Sister Mary Theresa
Queenan's Secretary
Other Prisoner
Chinese Government Man
Costello's Crew #1
Costello's Crew #2
Costello's Crew #3
Luncheonette Proprietor
Man in Costello's Bar
Priest w/ Young Colin
Priest at Billy's Funeral
Jimmy Pappas
Detective #2 Tailing Queenan
Detective #3 Tailing Queenan
Detective #4 Tailing Queenan
Lynn Detective
Drill Instructor #2 (voice)
Gang Member with Mr. French
Chinese Delivery Man
Executed Woman
French's Wife
Woman Doctor
Crack House Cop #1
Crack House Cop #2
Crack Addict
Exam Instructor
Bartender at Brasserie
Bookie in Costello's Bar
State Trooper #1
State Trooper #2
New Guy
New Guy
Executed Man
Waiter in Alley
Waiter in Alley
Little Girl at Airport
Young Man at Airport
Woman with Dog
Crack House Denizen
Triad (uncredited)
Reporter (uncredited)
Irish Thug (uncredited)
Gang Member (uncredited)
Crime Scene Unit (uncredited)
Cadet (uncredited)
Woman Office Worker (uncredited)
Academy Pistol Coach (uncredited)
EMT (uncredited)
Reporter (uncredited)
Academy Firearms Instructor (uncredited)
Rugby Fan (uncredited)
Officer (uncredited)
Southie Teen / Soccer Player (uncredited)
Pedestrian (uncredited)
Subway Passenger (uncredited)
MA State Police Detective
Adult Film Actress (uncredited)
Director
Casting
Producer
Editor
Director of Photography
Producer
Costume Design
Producer
Screenplay
Second Unit Director
Hairstylist
Special Effects Coordinator
Set Decoration
Hairstylist
Supervising Sound Editor
Production Design
Stunt Coordinator
Camera Operator
Script Supervisor
Art Direction
Hairstylist
Makeup Artist
Still Photographer
Location Manager
Makeup Artist
Makeup Artist
Visual Effects Producer
Dialect Coach
Sound Re-Recording Mixer
Music Editor
Music Editor
Makeup Artist
Art Department Coordinator
Assistant Art Director
Sound Effects Editor
Supervising Sound Editor
Hairstylist
Construction Coordinator
Sound Effects Editor
Camera Operator
Camera Operator
Digital Intermediate
Makeup Artist
Visual Effects Supervisor
Assistant Art Director
Transportation Coordinator
Costume Supervisor
Costume Supervisor
Unit Publicist
Assistant Director
Visual Effects Supervisor
Executive Producer
Set Decoration
Other
Original Film Writer
Original Film Writer
Other
Associate Producer
Special Effects
Actor's Assistant
Executive Producer
Executive Producer
Stunts
Special Effects
Electrician
Post Production Supervisor
Assistant Art Director
Scenic Artist
Stunts
Construction Coordinator
Dialogue Editor
Property Master
Dialogue Editor
Stunts
Stunts
Stunts
Stunt Driver
Stunts
Stunts
Stunts
Stunts
Foley Artist
Foley Editor
ADR Supervisor
ADR Supervisor
Original Music Composer
Foley Editor