Hans Von HerwarthHans-Heinrich Herwarth von Bittenfeld, also known as Johann von Herwarth, was a German diplomat in Moscow who provided the Allies with information prior to and during the Second World War. He revealed the secret pre-war pact made between Hitle and Stalin on how to divide Central Europe and continued to advise Western powers not to give in to Hitler's territorial demands. In 1955, Herwarth became the first post-war ambassador from Germany to London. Read More Read Less