Correct me if I’m wrong but weren’t the people fighting communists in 1943 fascist, nazi and anti-Semitic?
Not domestically.
Actually the communists in the Soviet Union helped Nazi, Germany invade Poland in 1939. The Soviet Union attacked from the East.
The only reason why they fought each other is because Hitler attacked them. The Soviets were not fighting for the Anti-Antisemitism as you seem to be implying.
It was about protecting Stalin and Soviet Russia.
Yes 1943 yes they were fighting after Germany invaded in 1941. So it makes sense for communists to say this.