The impression I got from the Polish resistance fighter was that the Jews that were rescured betrayed their saviors because they were Communists, not because they were Jews.
He had many fascinating stories. I wish I could have listened to him for a month, instead on only one night.
I think we’re both on the same page. Communists are inherently loathsome creatures, ready to betray anybody for the Cause. When people observe that a lot of Jews are Communist, the taint carries over to the whole Jewish community, much like the behavior of the black underclass taints the perception of the whole black community.