William Brooke Joyce (24 April 1906 – 3 January 1946), nicknamed Lord Haw-Haw, was an American-born member of the British Union of Fascists, the National Socialist League (UK), and the Nordic League. He moved to National Socialist Germany in 1939. He took German citizenship and became a propaganda broadcaster. Despite never being a British subject, Joyce was convicted of high treason in 1945 and sentenced to death.
The historian A.J.P. Taylor remarked in his book English History 1914–1945 that "Technically, Joyce was hanged for making a false statement when applying for a passport, the usual penalty for which is a small fine."
Joyce's biographer Nigel Farndale suggests on the basis of documents made public for the first time between 2000 and 2005 that Joyce made a deal with his prosecutors not to reveal links he had to the MI5, United Kingdom's domestic counter-intelligence and security agency. In return, his wife Margaret, known to radio listeners as "Lady Haw-Haw", was spared prosecution for high treason. "Joyce had also been working as an undercover agent for B5(b), a semi-autonomous department within MI5, responsible for surveillance and infiltration of extremist political groups."
- Love and treachery https://www.telegraph.co.uk/culture/books/3641790/Love-and-treachery.html