to the head. Collazo wounded another officer, and survived with serious injuries. Truman was not harmed at all but was at risk. He commuted Collazo's death sentence, after conviction in a federal trial, to life in prison. In 1979, President Jimmy Carter commuted it to time served. [ 19 ] December 11, 1960: While vacationing in Palm Beach, Florida , President-elect John F. Kennedy was threatened by Richard Paul Pavlick , a 73-year-old former postal worker. Pavlick intended to crash his dynamite -laden 1950 Buick into Kennedy's vehicle, but he changed his mind after seeing Kennedy's wife and daughter bid him goodbye. [ 20 ] Pavlick was arrested three days later by the Secret Service after being stopped for a driving violation; police found the dynamite in his car. Pavlick spent the next six years in both federal prison and mental institutions before being released in December 1966. April 13, 1972: Arthur Bremer carried a firearm to an event intending to shoot Nixon, but was put off by strong security. A few weeks later, he instead shot and seriously injured Governor of Alabama George Wallace . February 22, 1974: Samuel Byck planned to kill Nixon by crashing a commercial airliner into the White House . [ 21 ] He hijacked the plane on the ground by force, and was told that it could not take off with the wheel blocks still in place. After he shot the pilot and copilot, an officer shot Byck through the plane's door window. He