Both Sophie Scholl and Willi Graf attended some of Kurt Huber's lectures at the University of Munich. Kurt Huber was known amongst his students for the political innuendos which he used to include in his university lectures, by which he criticized Nazi ideology by talking about classical philosophers like Leibniz. He met Hans Scholl for the first time in June 1942, was admitted to the activities of the White Rose on 17 December 1942, and became their mentor and the main author of the sixth pamphlet.