Your challenge here is to create a World War 2 where communism is completely opposed to the Allies and serves the role as the "villain"/main threat; make communism as evil as possible. Fascism is allowed to exist here, but it NEEDS to be the lesser of two evils. How would such a WW2 start? Would the USSR be the equivalent of Germany? Could there be a Commie Axis, and if so then what would it be comprised of? Would any members of the OTL Axis or Allies join the side of this new Axis (e.g. Commie Germany?)? Would the US even get involved (and who else in the OTL war won't and will get involved?)?
EDIT: Try to avoid things like "Commie UK" or "Commie US".