"The Soviet Story" by young Latvian documentary filmmaker Edwins Snores argues that the Nazi and Communist regimes were mirror images and collaborated to an unexpected degree.
Snores says Hitler and Stalin had a secret agreement for the division of Europe; that Hitler gave Stalin permission to invade Nazi ally Finland and Stalin aided in the Nazi invasion of Norway. When the Luftwaffe bombed Poland, their planes were guided by navigational beams from Kiev. Communist parties in Europe were instructed to sabotage opposition to the Nazis and French Communists addressed their Nazi occupiers as "comrades."