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)
Costume Design
Editor
Producer
Casting
Producer
Director
Producer
Director of Photography
Screenplay
Second Unit Director
Set Decoration
Visual Effects Producer
Hairstylist
Supervising Sound Editor
Script Supervisor
Unit Publicist
Stunt Coordinator
Makeup Artist
Assistant Art Director
Sound Effects Editor
Transportation Coordinator
Dialect Coach
Hairstylist
Makeup Artist
Still Photographer
Costume Supervisor
Location Manager
Camera Operator
Music Editor
Assistant Art Director
Camera Operator
Costume Supervisor
Digital Intermediate
Production Design
Camera Operator
Hairstylist
Construction Coordinator
Makeup Artist
Art Department Coordinator
Art Direction
Hairstylist
Makeup Artist
Makeup Artist
Supervising Sound Editor
Sound Effects Editor
Special Effects Coordinator
Sound Re-Recording Mixer
Visual Effects Supervisor
Music Editor
Assistant Director
Visual Effects Supervisor
Executive Producer
Set Decoration
Original Film Writer
Other
Original Film Writer
Other
Associate Producer
Special Effects
Executive Producer
Actor's Assistant
Executive Producer
Special Effects
Stunts
Electrician
Post Production Supervisor
Assistant Art Director
Scenic Artist
Stunts
Construction Coordinator
Dialogue Editor
Dialogue Editor
Property Master
Stunts
Stunts
Stunts
Stunts
Stunts
Stunt Driver
Stunts
Stunts
ADR Supervisor
ADR Supervisor
Original Music Composer
Foley Editor
Foley Artist
Foley Editor
Props
Steadicam Operator
Stunts