Question: Who was the main rival of Johnny Torrio and Al Capone during the Chicago bootlegging wars of the 1920s?
Sentence (from "North Side Gang"): The North Side Gang, also known as the North Side Mob, was the dominant Irish-American criminal organization (although a large number of Polish-Americans were members as well) within Chicago during the Prohibition era from the early-to-late 1920s and principal rival of the Johnny Torrio–Al Capone organization, later known as the Chicago Outfit.
Relevant evidence: No