In the climax of the movie, James “Whitey” Bulger (Johnny Depp) is arrested by the FBI. His criminal empire and alliance with the FBI, particularly with agent John Connolly (Joel Edgerton), come crashing down as Bulger faces numerous charges, including racketeering, money laundering, and participation in 11 murders.
In the resolution, Bulger stands trial, and many of his former associates turn against him, providing crucial testimony. Bulger’s alliance with the FBI is exposed, and Connolly is implicated in aiding and abetting Bulger’s criminal activities.
Bulger is found guilty on multiple counts and is sentenced to two consecutive life terms in prison, plus five years. The film concludes with Bulger being transferred to a federal penitentiary.
The movie also explores the aftermath of Bulger’s arrest on the lives of those involved, particularly Connolly, who is ultimately convicted for his role in aiding Bulger. Bulger’s brother, William “Billy” Bulger (Benedict Cumberbatch), faces political repercussions due to his association with Whitey.
In summary, “Black Mass” ends with the downfall of Whitey Bulger, his arrest, trial, and conviction, shedding light on the extensive criminal activities and corruption that characterized his reign as a notorious mobster in Boston. The film provides a dark and gritty portrayal of the criminal underworld and the consequences of alliances between criminals and law enforcement.