The last person hanged in Britain for high treason was American William Joyce known to millions of Britons and Americans during World War II as "Lord Haw Haw". Joyce broadcast propaganda messages for the Nazis heard in the UK and the US on shortwave radio. He got the nickname after a journalist compared his upperclass English accent to a braying donkey. Born to Irish parents in New York, Joyce joined Oswald Mosley's Blackshirts in London. He left after clashing with Mosley, and moved with his wife to Berlin in the summer of 1939. War broke out soon after and Joyce was broadcasting for Hitler within a matter of months. Cambridge University historian Peter Martland recently gained access to British intelligence files on Joyce that were kept secret for fifty years. He told Minnesota Public Radio's Euan Kerr Joyce was remarkably successful, at first.