Which New York criminal mastermind was nicknamed Mr. Big?

Arnold Rothstein (1882-1928) was nicknamed Mr. Big.

Arnold Rothstein financed the criminal operations of Lucky Luciano, Legs Diamond, and others.

Also known as the Brain, the Fixer, and the Man Uptown, Rothstein was said to have played a role in fixing the 1919 World Series.

Arnold “The Brain” Rothstein was a New York businessman who became a famous kingpin of organized crime and headed the Jewish mafia.