The Purple Gang, also known as the Sugar House Gang, was a criminal mob of bootleggers and hijackers composed predominantly of Jewish gangsters. They operated in Detroit, Michigan, during the 1920s of the Prohibition era and came to be Detroit's dominant criminal gang. Excessive violence and infighting caused the gang to destroy itself in the 1930s.

Jewish-American organized crime initially emerged within the American Jewish community during the late 19th and early 20th centuries. In media and popular culture, it has variously been referred to as the Jewish Mob, the Jewish Mafia, the Kosher Mob, the Kosher Mafia, the Yiddish Connection, and Kosher Nostra or Undzer Shtik. The last two of these terms are direct references to the Italian cosa nostra; the former is a play on the word for kosher, referring to Jewish dietary laws, while the latter is a calque of the Italian phrase 'cosa nostra' into Yiddish, which was at the time the predominant language of the Jewish diaspora in the United States.