A cop shooting a Thompson submachine gun. A Thompson submachine gun (or Tommy gun) was a type of submachine gun. They were very common back in the 1930s and '40s, and weren't fully phased out of use by most law enforcement agencies until the '70s, when they became obsolete. They were also commonly used by Prohibition Era criminals. References ↑ As seen in The Mechanical Monsters. External Link Thompson submachine gun at Wikipedia Retrieved from "https://superfriends.fandom.com/wiki/Thompson_submachine_gun?oldid=80263" Categories: Equipment Definitions DC Comics Community content is available under CC-BY-SA unless otherwise noted.