Sir Oswald Ernald Mosley, 6th Baronet (16 November 1896 – 3 December 1980), was a British politician who rose to fame during the 1920s and 1930s when, disillusioned with mainstream politics, he turned to fascism. He was Member of Parliament (MP) for Harrow from 1918 to 1924 and for Smethwick from 1926 to 1931. He founded the British Union of Fascists (BUF) in 1932 and led it until its forced disbandment in 1940.
After military service during the First World War, Mosley became the youngest sitting member of Parliament, representing Harrow from 1918, first as a member of the Conservative Party, then an independent, and finally joining the Labour Party. At the 1924 general election he stood in Birmingham Ladywood against the future Prime Minister Neville Chamberlain, coming within 100 votes of defeating him. Mosley returned to Parliament as the Labour MP for Smethwick at a by-election in 1926 and served as Chancellor of the Duchy of Lancaster in the Labour government of 1929–1931. In 1928 he succeeded his father as the sixth Mosley baronet, a title in his family for over a century. Some considered Mosley a rising star and a possible future prime minister.