The Departed 2006

An undercover cop and a mole in the police attempt to identify each other while infiltrating an Irish gang in South Boston.

When a state police officer goes deep undercover in a ruthless Irish mob, he finds himself in a deadly race against time to unmask a corrupt cop secretly working within the department as an informant. As both sides hunt for the mole in their midst, the line between cop and criminal blurs in a violent game where trust is a luxury no one can afford.