Black Mass is the riveting true story of James "Whitey" Bulger—the brother of a state senator and the most infamous violent gangster in the history of South Boston—who became an FBI informant to take down a Mafia family invading his turf.In this episode of VICE Talks Film, legendary filmmaker William Friedkin (The Exorcist, The French Connection) sits down with Black Mass director Scott Cooper to talk about the complexities of the film's chilling true story and Johnny Depp's acting transformation into the ruthless sociopath.Black Mass hits theaters everywhere on September 19.