Two of the most notorious mobsters responsible for making Las Vegas what it is today were Benjamin Bugsy  Siegel and Meyer Lansky. In 1946, Meyer Lansky began showing interest in investing in Las Vegas casinos.

Capone, for one, inherited criminal enterprises in Chicago and then established a dynasty of casinos. Besides muscle and money, Capone used his talent for public relations to deflect attacks on his brazen disregard for the law. I give the public what the public wants,  he once told a reporter.