Thanks for the query.
William Brooke Joyce (24th April, 1906 - 3rd January, 1946), nicknamed and better known as Lord Haw-Haw was an American Born Irish British politician and Nazi propaganda broadcaster to the UK during WW II. He was captured by British forces in 1945 and was convicted of one count of high treason and sentenced to death. He was the last person to be executed for treason in UK.
Sources: https://en.wikipedia.org/wiki/William_Joyce and https://en.wikipedia.org/wiki/William_Joyce