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Sir Oswald Ernald Mosley, 6th Baronet of Ancoats, was a British politician and Member of Parliament. In 1932, Mosley formed and became the leader of the British Union of Fascists. The party was renamed the National Socialists in 1936 and British Union in 1937 and was said to be modelled on Adolf Hitler's National Socialist German Workers' Party. After the outbreak of the Second World War, the British Security Service and Special Branch became increasingly worried that the British Union of Fascists was gathering public support that might undermine the war effort. Mosley was therefore interned under Defence Regulation 18B in 1940. Papers of the Advisory Committee on Defence Regulation 18B, comprises mainly of transcripts of its hearings of individual cases of detainees. This collection concerns Sir Oswald Mosley's appeal against his detention during the Second World War and includes papers of Norman Birkett, KC, concerning the British Union of Fascists. The records in this collection provide unique insight into the founding of the British Union of Fascists and how it operated within the British political system.