Here is the link to a really cool article I found outlining the “Top 15 Crime Bosses” around the world. The list ranges from leaders of the Chicago mafia to the Russian mafia, from New York City to Japan. It’s fascinating to see how high-profile organized crime is prevalent in many different countries around the globe.
http://listverse.com/2012/06/05/top-15-crime-bosses-and-drug-lords-in-2012/
Semion Mogilevich is #1 on the list of the Top 15 Crime Bosses around the world. He is known as “the most dangerous mobster in the world,” and is believed to be the leader of the Russian Mafia.
The American Mafia 