The Most Dangerous Mob and Cartel Members in History

Semion Mogilevich, often called “The Brainy Don,” is a Ukrainian-born businessman and alleged leader of the Russian Mafia. He’s been linked to arms trafficking, fraud, and massive money-laundering operations stretching from Eastern Europe to the United States.

Known for his intelligence and connections, Mogilevich built a criminal network that blended legitimate finance with global crime. He has reportedly worked through shell companies and corrupt officials to protect his empire. Though he’s been indicted in the U.S., he continues to live freely in Russia, making him one of the most untouchable figures in organized crime.