Donnie Brasco talking to Benjamin Lefty Ruggerio REAL wiretap Part 3

Pistone was a pioneer for deep long-term undercover work. The FBI's former director, J. Edgar Hoover, who died in 1972, did not want FBI agents to work undercover, because of the danger of the agents becoming corrupted. But Pistone's work later helped convince the FBI that using undercover agents in lieu of relying exclusively on informants was a crucial tool in law enforcement.