While they saw Eastern slavs as subhuman not so much those to the south of them.

Yeah they treated for instance the Czechs and Croats much better. The Nazis actual views on Slavs were more complicated than I understood when i wrote this initially - but this is all sort of tangential to the main point which is that The Allies did not have anything in common ideologically with the modern left and would not agree with them on their lunacies regarding race/gender/etc.