On 22 July 2011, Anders Behring Breivik took a boat to the small island of Utøya on a Norwegian lake not far from Oslo. Dressed as a police officer, he claimed to be checking on the safety of a Labour party youth camp after an explosion in downtown Oslo hours earlier. The campers did not know that Breivik was not a police officer, that he was responsible for the blast, or that he viewed them as traitors. When they gathered around, Breivik, armed with a Ruger Mini-14... (GunPolicy.org)