Why Did Fascists and Communists Hate Each Other?

In this episode of Out of the Foxholes, we dive into your community questions about World War II. Why did fascists and communists despise each other? Was Barbarossa a pre-emptive strike by Hitler? How did forced repatriations at the end of the war influence the 1951 Refugee Convention? How did Hitler and Mussolini's cults of personality compare?