Hated and adored, trusted and feared, respected and scorned - public opinion has never been indifferent to Sir Oswald Mosley. A brilliant politician, Mosley turned his back on conventional party politics to found, in 1932, the British Union of Fascists. Over the intervening years, many have worked hard to guard Mosley's reputation but Blackshirt casts new light on the man. It reveals the true nature of his relationship with the Nazis, and challenges the prevailing view of his descent into anti-Semitism. With ground-breaking research, Stephen Dorril uncovers an extraordinary set of characters and behind-the-scenes friends and colleagues who supported Mosley - the crooks, swindlers, political and royal figures, secret agents, Nazi spies, lovers and 'crackpots' - and who helped to create the most infamous politician of the twentieth century.