 It was one of the most violent gangs of the early 20th century and became famous for the murder of gambler and gangster Herman Rosenthal.In the early 1920s, stimulated by the economic opportunities of the roaring twenties, and later prohibition, Jewish organized crime figures such as Arnold Rothstein were controlling a wide range of criminal enterprises, including bootlegging, loansharking, gambling, and bookmaking.According to crime writer Leo Katcher, Rothstein "transformed organized crime from a thuggish activity by hoodlums into a big business, run like a corporation, with himself at the top."