Sinopsis
El Departamento de Policía de Massachussets se enfrenta a la mayor banda de crimen organizado de la ciudad de Boston. La estrategia consiste en acabar desde dentro con Frank Costello, el poderoso jefe de la mafia irlandesa. El encargado de infiltrarse en la banda es un joven novato, Billy Costigan. Mientras Billy intenta ganarse la confianza de Costello, otro joven policía, Colin Sullivan, sube rápidamente de categoría y ocupa un puesto en la unidad de Investigaciones Especiales, grupo de élite cuya misión también es acabar con Costello. Lo que nadie sabe es que Colin es un topo infiltrado en la policía por el propio Costello.
Reparto
Leonardo DiCaprio — BillyMatt Damon — ColinJack Nicholson — CostelloMark Wahlberg — DignamMartin Sheen — QueenanRay Winstone — Mr. FrenchVera Farmiga — MadolynAnthony Anderson — BrownAlec Baldwin — EllerbyKevin Corrigan — Cousin SeanJames Badge Dale — BarriganDavid O'Hara — FitzyMark Rolston — DelahuntRobert Wahlberg — Lazio (FBI)Kristen Dalton — GwenThomas B. Duffy — GovenorRichard Hughes — Uncle EdwardJ.C. MacKenzie — RealtorMary Klug — Billy's AuntPeg Holzemer — Mrs. KennefickRobert 'Toshi' Kar Yuen Chan — Triad BossGurdeep Singh — Pakistani ProprietorArmen Garo — Providence Gangster #1John Cenatiempo — Providence Gangster #2Joseph Riccobene — Kneecapped BankrobberBilly Smith — Detective #1 Tailing QueenanLyman Chen — TranslatorKevin P. McCarthy — Detective #1 - Colin's UnitChris Fischer — Detective #2 - Colin's UnitBrian Smyj — Man Glassed in BarWilliam Severs — Older PriestLarry Mitchell — Younger PriestAnthony Estrella — Police Camera TechAndrew Breving — Police Cell Phone TechTracey Paleo — Darlene the SecretaryDouglas Crosby — Man Killed by FrenchDorothy Lyman — Woman at Bar #1Audrie Neenan — Woman at Bar #2Frank Mallicoat — News AnchorPaula DeMers — Billy's MotherConor Donovan — Young ColinAmanda Lynch — CarmenSallie Toussaint — Woman at OperaPatrick Coppola — Bookie Harassed by FrenchMick O'Rourke — Jimmy BagsDeborah Carlson — Sister Mary TheresaNellie Sciutto — Queenan's SecretaryPeter Welch — Other PrisonerHenry Yuk — Chinese Government ManDennis Lynch — Costello's Crew #1Michael Byron — Costello's Crew #2William Lee — Costello's Crew #3John Rue — Luncheonette ProprietorPeter Crafts — Man in Costello's BarJoseph P. Reidy — Priest w/ Young ColinJohn Farrer — Priest at Billy's FuneralParis Karounos — Jimmy PappasBrian Haley — Detective #2 Tailing QueenanTerry Serpico — Detective #3 Tailing QueenanJay Giannone — Detective #4 Tailing QueenanJohn Polce — Lynn DetectiveBo Cleary — Drill Instructor #2 (voice)David Conley — Gang Member with Mr. FrenchVictor Chan — Chinese Delivery ManJill Brown — Executed WomanSarah Fearon — French's WifeDenece Ryland — Woman DoctorDaniel F. Risteen, Jr. — Crack House Cop #1Francis P. Hughes — Crack House Cop #2Johnny Cicco — Crack AddictChance Kelly — Exam InstructorShay Duffin — Bartender at BrasserieJohn McConnell — Bookie in Costello's BarKenneth Stoddard — State Trooper #1Jeffrey Winter — State Trooper #2Paddy Curran — New GuyMark Philip Patrick — New GuyDavid Fischer — Executed ManWalter Y.F. Wong — Waiter in AlleyTony M. Yee — Waiter in AlleyFrancesca Scorsese — Little Girl at AirportAlex Morris — Young Man at AirportEmma Tillinger Koskoff — Woman with DogCraig Castaldo — Crack House Denizen坂東工 — Triad (uncredited)Eric Bruno Borgman — Reporter (uncredited)Brendan Burke — Irish Thug (uncredited)Chris Chinn — Gang Member (uncredited)Jeffrey Corazzini — Crime Scene Unit (uncredited)Jim Ford — Cadet (uncredited)Trudi Goodman — Woman Office Worker (uncredited)Steve Lord — Academy Pistol Coach (uncredited)Jack McCullough — EMT (uncredited)Osmani Rodriguez — Reporter (uncredited)Lawrence Cameron Steele — Academy Firearms Instructor (uncredited)Conor Timmis — Rugby Fan (uncredited)Joseph Oliveira — Officer (uncredited)Adam Masnyk — Southie Teen / Soccer Player (uncredited)John Franchi — Pedestrian (uncredited)Paul McGillicuddy — Subway Passenger (uncredited)Kim Carrell — MA State Police DetectiveRebecca Love — Adult Film Actress (uncredited)