Which film is about people who are locked in a race to find moles on both sides of the law?

"The Departed" is a 2006 film which is about people who are locked in a race to find moles on both sides of the law. In the film, a South Boston cop Billy Costigan (Leonardo DiCaprio) goes undercover to infiltrate the organization of a gangland chief named Frank Costello (Jack Nicholson). As Billy gains the mobster's trust, a career criminal named Colin Sullivan (Matt Damon) infiltrates the police department and reports on its activities to his crime syndicate bosses. When both organizations learn they have a mole in their midst, Billy and Colin must figure out each other's identities to save their own lives.

"The Departed" is an American crime drama film which was directed by Martin Scorsese and written by William Monahan. It is a remake of the 2002 Hong Kong film "Infernal Affairs". It was produced by Brad Pitt, Brad Grey, and Graham King. Warner Bros. Pictures made distribution when the picture was released in September 2006. "The Departed" stars DiCaprio, Nicholson, Matt Damon, and Mark Wahlberg, with Martin Sheen, Ray Winstone, Vera Farmiga, Anthony Anderson, and Alec Baldwin in supporting roles.

The film was a critical and commercial success. Worldwide it grossed 291.5 million US dollars at the box office. It also received major awards; it won some key awards, including 4 Oscars at the 79th Academy Awards, for Best Picture, Best Director, Best Adapted Screenplay, and Best Film Editing. Mark Wahlberg was also nominated for an Oscar for Best Supporting Actor.