To take down South Boston’s Irish crime/">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.

IMDb link: 0407887
IMDb rating: 8.5 (1,485,781 votes)
Genres: Thriller, Crime, Drama
Director: Martin Scorsese, Jack Nicholson
Cast: Matt Damon, Leonardo DiCaprio, Mark Wahlberg and others