Dean C. "Deanie" O'Banion (July 8, 1892 – November 10, 1924) was an Irish-American mobster who was the main rival of Johnny Torrio and Al Capone during the brutal Chicago bootlegging wars of the 1920s. The newspapers of his day made him better known as Dion O'Banion, although he never went by that first name. He led the North Side Gang until he was murdered by Frankie Yale, John Scalise and Albert Anselmi in 1924.

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