Anything is possible.
Lots of Jews were Communists. Lots of Communists are fanatical.
I recall a Soviet Movie (The Forty-First) about shipwrecked lovers during White and Red wars in Russia. In the movie, the woman is a Communist, the man a White Russian (anti-communist). At the end of the movie, a ship is sighted. It is a White ship, so the Red woman kills her lover to prevent him from being rescued.
That was considered the height of moral behavior by the Communists.