Sir Oswald Ernald Mosley, 6th Baronet was a British politician who rose to fame in the 1920s as a Member of Parliament and later in the 1930s, having become disillusioned with mainstream politics, became the leader of the British Union of Fascists. Mosley had not been knighted, but he was the sixth baronet, with a title that had been in his family for more than a century at his father's death on 21 September 1928.
After military service during the First World War, Mosley was one of the youngest members of parliament, representing Harrow from 1918 to 1924, first as a Conservative, then an independent, before joining the Labour Party. At the 1924 general election he stood in Birmingham Ladywood against future Prime Minister Neville Chamberlain, coming within 100 votes of beating him.
Mosley 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 because of discord with the Government's unemployment policies.