Charles Harrelson, the father of actor Woody Harrelson, became one of the FBI's Most Wanted after being convicted of multiple crimes, including the contract killing of a federal judge, John H. Wood Jr., in 1979. This assassination marked the first murder of a federal judge in the 20th century, thrusting Harrelson into national infamy. His criminal activities, which also included other contract killings and involvement in organized crime, led to a life sentence, solidifying his notorious status.