WW2 US Army Thompson Submachine Gun M1928 with detachable round ammo drum
"Tommy Gun"
 
The Thompson submachine gun is an American submachine gun invented by John T. Thompson in 1918 which became infamous during the Prohibition era, being a signature weapon of various crime syndicates in the United States. It was a common sight in the media of the time, being used by both law enforcement officers and criminals. The Thompson submachine gun was also known informally as the "Tommy Gun", "Tôm Sông", "Annihilator", "Chicago Typewriter", "Chicago Submachine", "Chicago Piano", "Chicago Style", "Chicago Organ Grinder", "Trench Broom", "Trench Sweeper", "Drum Gun","The Chopper", and simply "The Thompson"