"In Hitler's Germany, when to be a Communist or Socialist or militant trade unionist or liberal... democrat meant arrest, the concentration camp, and often death and torture, when there was institued one of the most thoroughgoing "purges" of literature and burning of books that the world has ever known, when Schiller's "Don Carlos", the poems of Heine and the novels of Thomas Mann were banned or burned as "subversive", the writings of Trotsky were widely translated and distributed."