Conversation so far:
What was Alfred Rosenberg's first wartime propaganda effort?
Alfred Rosenberg was one of the few in the Nazi hierarchy who advocated a policy designed to encourage anti-Communist opinion among the population of the occupied territories.
Who else in the Nazi party influenced Alfred Rosenberg?
Alfred Rosenberg was both an antisemite who was influenced by Houston Stewart Chamberlain's book The Foundations of the Nineteenth Century.

Question: What was his main propaganda theme?
Self-contained rewrite: What was Alfred Rosenberg's main propaganda theme?