John Beckett was a rising political star. Elected as Labour's youngest M.P. in 1924, he was constantly in the news and tipped for greatness. But ten years later he was propaganda chief for Mosley's fascists, and one of Britain's three best known anti-Semites. Yet his mother, whom he loved, was a Jew. Her ancestors were Solomons, Isaacs and Jacobsons, originally from Prussia. He successfully hid his Jewish ancestry...