The Saint Valentine's Day Massacre, for those unfamiliar, was a shootout that took place in Chicago in 1929. It involved Al Capone's gang (who were Italian) facing off against members of gangster Bugs Moran's crew (who were Irish). The shootout stemmed from shady liquor shipment deals. In total, seven people were murdered, and a dizzyingly-extensive police investigation followed. Capone, who survived the massacre, was sent to prison for tax evasion several years later. That, along with the 18th Amendment (repealing Prohibition) and failing health due to syphilis, would lessen Capone's influence. He died in 1947, but has since become the archetype for the early 20th century mob boss.