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Arnold Rothstein, often referred to as "The Brain," stands out as a legendary figure in the early days of organized crime. His strategic mindset transformed mob operations from mere street gangs into a cohesive business-oriented structure. Accorded the infamy for fixing the 1919 World Series, Rothstein was a shrewd gambler who dipped his toes into various illegal enterprises, especially during Prohibition with speakeasies. He mentored significant mob leaders like Lucky Luciano, sharing his vision of treating organized crime as a business rather than a chaotic underworld.