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 … Jack Nicholson, Leonardo DiCaprio, Matt Damon, Mark Wahlberg, Vera Farmiga, Martin Sheen, Ray Winstone Added on HBO 2022-06-06. Youtube Trailer