Question: Who was the main rival of Johnny Torrio and Al Capone during the Chicago bootlegging wars of the 1920s?
Sentence (from "Dean O'Banion"): Charles Dean O'Banion (July 8, 1892 – November 10, 1924) was an American mobster who was the main rival of Johnny Torrio and Al Capone during the brutal Chicago bootlegging wars of the 1920s.
Relevant evidence: Yes