Frank Russell was the grandson of Prime Minister Lord John Russell and elder brother of philosopher and political activist Bertrand Russell. He was, in his own right, a radical political reformer and outspoken self-determined moralist. He was also the black sheep of his illustrious family: a serial adulterer, tried for bigamy in the House of Lords, who, as a young man, had been sent down from Oxford for supposed homosexual practices. His accuser was...