Wilhelmstraßen-Prozess
At the Nuremberg trials, he appeared at the Ministries Trial as a witness for both the prosecution and the defence. When questioned in the trial of his former superior Wilhelm Stuckart, he confirmed that he knew that "Jews were being put to death "en masse"". He had known at that time that "the extermination of the Jews was systematic", but, he said, restricting his statement, "not that it referred to all Jews".