Sir Oswald Ernald Mosley, 6th Baronet of Ancoats was a British politician who rose to fame in the 1920s as a Member of Parliament and later in the 1930s became leader of the British Union of Fascists.
After military service during the First World War, Mosley was one of the youngest Members of Parliament for Harrow from 1918 to 1924, first as a Tory, then an independent, before joining the Labour Party. He returned to Parliament as Labour MP for Smethwick at a by-election in 1926, and served as Chancellor of the Duchy of Lancaster in the Labour Government of 1929–31. He was considered a potential Labour Prime Minister, but resigned due to discord with the Government's unemployment policies. He then founded the New Party. He lost his seat at Smethwick in 1931. The New Party merged with the British Union of Fascists in 1932.
Mosley was imprisoned in May 1940 and the BUF was banned. He was released in 1943, and, politically disgraced by his association with fascism, he moved abroad in 1951, spending most of the remainder of his life in Paris, France. He stood for Parliament twice in the postwar era, achieving very little support.