Public policy as related to preventing gun violence is an ongoing political and social debate regarding both the restriction and availability of firearms within the United States. Policy at the Federal level is/has been governed by the Second Amendment, National Firearms Act, Gun Control Act of 1968, Firearm Owners Protection Act, Brady Handgun Violence Prevention Act, Violent Crime Control and Law Enforcement Act, and the Domestic Violence Offender Act. Gun policy in the U.S. has been revised many times with acts such as the Firearm Owners Protection Act, which loosened provisions for gun sales while also strengthening automatic firearms law.[167]