People don't usually associate the words "Jewish" and "gangster," but in the early to mid 1900's a number of prominent mob figures were, in fact, members of the tribe.
One such personality was Benjamin Siegel, who later became known as "Bugsy" Siegel. Handsome, quick to anger and ruthless, from a young age he became involved in criminal activity. He played an important role in forming the original Las Vegas casinos, though this same role ultimately led to his murder.
Learn more about Bugsy Siegel in: Benjamin "Bugsy" Siegel - Jewish American Mobster.