Gangsters: America's Most Evil

James "Whitey" Bulger is one of the most notorious organized crime bosses in American history.

Known as the Monster of Atwater Village, Timothy McGhee was a big part of the Toonerville gang.

Vincent Smothers was one of Detroit's most notorious killers but he didn't start out that way.

Raquel Hortencia Medelles-Arguella was the mastermind of the biggest sex ring to be busted in Texas.

Marvin Mercado and his brother Pierre were major players in the Asian Boyz gang in the 1990s.

Ross William Ulbricht, the man behind Silk Road, an online marketplace for illegal drugs.