The term "Jewish mob" refers to organized crime groups that were primarily composed of Jewish individuals, particularly in the early to mid-20th century. These groups often operated in urban areas, engaging in activities such as bootlegging, gambling, and extortion. Notable figures associated with the Jewish mob include Meyer Lansky and Bugsy Siegel, who played significant roles in the development of organized crime in the United States. While the Jewish mob was prominent in cities like New York and Chicago, it was not a monolithic entity. Various factions existed, often competing with each other and with other ethnic crime groups. Over time, the influence of the Jewish mob diminished, as many members assimilated into mainstream society or shifted to legitimate businesses.