In the late 1970s, FBI agent Joe Pistone embarked on a perilous six-year undercover mission, infiltrating the Bonanno crime family under the alias Donnie Brasco. By embedding himself within the mob's inner circle, Pistone provided the FBI with unprecedented intelligence on the inner workings of the New York Mafia, ultimately leading to the conviction of over 200 mobsters and the dismantling of one of the most powerful crime families in American history.