20 Notorious Criminals You Never Knew Were In The FBI Witness Protection Program

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15. Nicky Barnes

At the height of his success as a crime boss, Nicky Barnes appeared on the front of The New York Times Magazine with the headline “Mr Untouchable.” Ultimately, vengeance brought him down. When he caught his mistress sleeping with a fellow mobster, he turned informant and handed over 109 names to authorities.

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14. Primo Cassarino

Primo Cassarino wasn’t a nice man – he was a criminal, an enforcer, and according to his own lawyer he had “the foulest mouth in Brooklyn.” He was even involved in an extortion attempt against actor Steven Seagal. But in 2004, facing prison, he gave up crime and became a government witness.

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