Regardless, here are five successful undercover cops. 5 Joseph Pistone The first entry is someone you probably already know, though by another name: Donnie Brasco. Joseph Pistone was the real ...

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This true story follows FBI agent Joe Pistone as he infiltrates the New York Mafia. Befriending Lefty Ruggiero, Pistone (under the name Donnie Brasco) is able to embed himself in a Mafia faction ...