Watch Full movie: The Departed (2006), Online Free.
An undercover state cop who infiltrated a Mafia clan and a mole in the police force working for the same mob race to track down and identify each other before being exposed to the enemy, after both sides realize their outfit has a rat.
Director: Martin Scorsese
Writers: William Monahan (screenplay)
Stars: Leonardo DiCaprio, Matt Damon, Jack Nicholson