Yes, "Black Mass" is based on a true story. The film chronicles the life of notorious Boston mobster James "Whitey" Bulger, who was the leader of the Winter Hill Gang. It details his relationship with the FBI, particularly with agent John Connolly, who acted as an informant. The film explores themes of crime, betrayal, and corruption, illustrating how Bulger evaded law enforcement for years while maintaining his criminal empire. It is adapted from the book "Black Mass: The True Story of an Unholy Alliance Between the FBI and the Irish Mob."

"Black Mass" is a crime drama film released in 2015, based on the true story of infamous mobster James "Whitey" Bulger. Played by Johnny Depp, Bulger rises to power in Boston during the 1970s and 1980s while simultaneously collaborating with the FBI as an informant to eliminate his rivals. The film explores themes of crime, loyalty, and betrayal, showcasing Bulger's complex relationships with law enforcement, family, and fellow criminals. Directed by Scott Cooper, it provides a gritty portrayal of Bulger's life and the impact of his actions.

Yes, James "Whitey" Bulger, the notorious Boston mobster portrayed in the film "Black Mass," did watch the movie. He reportedly saw it while incarcerated and expressed his discontent with the portrayal of his life and character. Bulger felt that the film did not accurately represent him and was critical of the way he was depicted, particularly in terms of his relationships and actions. "Black Mass," released in 2015, stars Johnny Depp as Bulger and is based on the true story of his criminal activities and connections with the FBI.