Turner joined the Federal Bureau of Investigation (FBI) in 1951. He worked for the FBI for ten years but grew increasingly concerned with the way J. Edgar Hoover ran the organization. Turner became convinced that Hoover was placing too much emphasis on the dangers of the American Communist Party. Instead, he felt he should be using more resources to tackle organized crime. In 1961 Turner was dismissed from the FBI. He hired Edward Bennett Williamsand sued the FBI but lost. However he did manage to get anti-Hoover testimony by other agents into the record.
Source: JFKcountercoup on William Weyland Turner (1927-2015)