William Stetson Kennedy (October 5, 1916 – August 27, 2011) was an American author, folklorist and human rights activist. One of the pioneer folklore collectors during the first half of the 20th century, he is remembered for having infiltrated the Ku Klux Klan in the 1940s, exposing its secrets to authorities and the outside world. His actions led to the 1947 revocation by the state of Georgia of the Klan's national corporate charter. Kennedy wrote or co-wrote ten books.