This category is for American gangsters active between the end of World War I and the beginning of World War II. It combines figures associated with the Prohibition era (1920–1933), known for involvement in bootlegging and vice operations; along with prominent criminals during the Great Depression, often involved in bank robberies, extortion, and illegal gambling. These individuals capitalized on the social and economic disruptions of the period, playing significant roles in the history of American organized crime.