A look at Whitey Bulger, who rose to fame in the 1970s as he killed his way through the ranks and became Boston's most famous gangster in history.

During the 1990s, three violent cartels fought for dominance of the Mexican drug world. El Chapo managed to rise above the rest to form one unified cartel and became the most powerful criminal in Mexico's history.

A look at Pablo Escobar's rise in 1970s Colombia, from his time as a petty thief to becoming one of history's most powerful criminals.

A look at the infamous Gambino crime family who ruled the New York in the 1980s. The American Mafia family was at war with themselves, as one murderous capo will emerge as The Boss of Bosses.