Rudolf Lindau spent the twelve Nazi years in the Soviet Union. During this time, war broke out again. In the case of the war between Germany and the Soviet Union this occurred in June 1941, following repudiation from the German side of the non-aggression pact that the two dictatorships had concluded nearly two years earlier. During his time in Moscow Lindau taught at the Party Academy and, later, at the set up for the re-education of German prisoners of war. He also worked in the Soviet sponsored &lt;a href="National%20Committee%20for%20a%20Free%20Germany"&gt;National Committee for a Free Germany (NKFD / "Nationalkomitee Freies Deutschland")&lt;/a&gt;. Additionally, at the Krasnogorsk-based "Academy for Leninism" at, a short distance outside Moscow, he got to know Walter Ulbricht who by 1949 would have emerged as the leader of a new kind of German state.