FRONTLINE investigates how the National Rifle Association in the United States uses its unrivaled political power to stop gun regulation in America. With first-hand accounts of school killings in Newtown and Columbine, and the shooting of Congresswoman Gabby Giffords, Gunned Down examines why despite the national trauma over gun violence politicians haven’t acted. Drawing on interviews with leading voices on both sides of the gun regulation debate, FRONTLINE goes inside one of the United States’ greatest divides to illuminate how the NRA reinvented itself from a group of gun enthusiasts with minimal political focus, to a powerful lobbying force opposing any perceived infringement of the constitutional right to bear arms.