Why was Arnold Rothstein an important 1920s American figure?

Arnold Rothstein was a pivotal figure in the 1920s due to his role as a major organized crime boss and his influence on the illegal gambling industry in the United States. Often referred to as the "Brain" of organized crime, he was instrumental in establishing the infrastructure for bootlegging and other illicit activities during Prohibition. Rothstein's connections with political figures and law enforcement allowed him to operate with relative impunity, shaping the landscape of American organized crime and influencing the culture of the era. His involvement in high-profile events, such as fixing the 1919 World Series, further solidified his notorious reputation.