John Taliaferro Thompson had a mission: to develop a lightweight, fast-firing weapon that would help Americans win on the battlefield. His Thompson submachine gun could deliver a hundred bullets in a matter of seconds but didn't find a market in the U.S. military. Instead, the Tommy gun became the weapon of choice for a generation of bootleggers and bank-robbing outlaws, and became a deadly American icon. Following a bloody decade and eighty years before the mass shootings of our own time Congress moved to take this weapon off the streets, igniting a national debate about gun control.