NAZI's and Communists are two sides of the same coin. Both are socialist and Statists. The State over everything else. NAZI's allowed capitalism but made the capitalist owners of factories make what they wanted first. Communists want government control or ownership over all property. Both are evil. Both restrict freedom.
I read where the Heinkel aircraft company made passenger planes in the 1930's. Twin engine, but only held 10-20 passengers. Hitler wanted Heinkel to make them into bombers (mid-1930's before the war started). Mr. Heinkel said no, he was against war and WWI was enough for him. Mr. Heinkel died about a month or two later (said it was a heart attack). The new owners made Hitler's bombers. Hmm, sound familiar? Putin had some of his political enemies killed.
NAZI's (German version) hated Slavic people and thought they were inferior to Germanic peoples (Germans, Nortics, French, English). Thus hating Communists, who were mostly loyal to the Soviet version. Vice versa on Communists. Communists hated NAZI's for allowing private ownership to continue even though the government strictly controlled what the made (war materials).