For ten points, name this gangster who, like Seth Teitler, controlled the south side of Chicago.
This protégé of Johnny Torrio was once embroiled in a conflict with the O'Donnell brothers. The opposition of William Emmett Dever forced this man to relocate to the city of Cicero, but this man later formed a relationship with Big Bill Thompson that allowed him to return and form a headquarters at the Lexington Hotel. This man's top lieutenants include Jack McGurn, and his rivals include Hymie Weiss. This enemy of Buggs Moran was eventually sent to Alcatraz for tax evasion, but not before wiping out his opponents at the St. Valentines Day Massacre. For ten points, name this gangster who, like Seth Teitler, controlled the south side of Chicago.
This protégé of Johnny Torrio was once embroiled in a conflict with the O'Donnell brothers.
{Al Capone} [accept: {Alphonse Gabriel Capone}]