Jack Nicholson, Alec Baldwin, Mark Wahlberg and Vera Farmiga play various other players on either side of the cop/criminal divide, which becomes increasingly blurry as the film progresses. Scorsese remakes the Hong Kong film Infernal Affairs while connecting it to his longtime interest in real-life American criminals, modeling some of the characters on actual figures from the Boston underworld. DiCaprio and Matt Damon play South Boston natives on opposite sides of the law, one a cop sent to infiltrate the local mob, the other a mobster placed as a spy within the state police. (Image credit: Pictorial Press Ltd / Alamy Stock Photo)ĭiCaprio is just one famous face in this star-packed crime drama about star-crossed undercover operatives.