Rudolf Hess, Hitler's secretary who would assist in the writing of "Mein Kampf", was a close student of Haushofer's. While Hess and Hitler were imprisoned after the Munich Putsch in 1923, Haushofer spent six hours visiting the two, bringing along a copy of Friedrich Ratzel's "Political Geography" and Carl von Clausewitz's "Vom Kriege". After World War II, Haushofer would deny that he had taught Hitler, and claimed that the National Socialist party perverted Hess's study of geopolitik. He viewed Hitler as a half-educated man who never correctly understood the principles of geopolitik passed onto him by Hess, and Foreign Minister Joachim Ribbentrop as the principle distorter of geopolitik in Hitler's mind. While Haushofer accompanies Hess on numerous propaganda missions, and participated in consultations between Nazis and Japanese leaders, he claimed that Hitler and the Nazis only seized upon half-developed ideas and catchwords. Furthermore, the Nazi party and government lacked any official organ that was receptive to geopolitik, leading to selective adoption and poor interpretation of Haushofer's theories. Ultimately, Hess and Von Neurath, Nazi Minister of Foreign Affairs, were the only officials Haushofer judged to have had a proper understanding of geopolitik.