The most pro-commie Hollywood production I have ever seen was MISSION TO MOSCOW(1943).
They laid the communism on thick, and the last scene was of people all going to a shining city on the hill.
Then there is the 1938 "comedy" YOU CAN'T TAKE IT WITH YOU, that is anti-capitalism, anti-wealthy people, pro-Communism, and has a "DO YOUR OWN THING" theme that it revolting !
There are many such films, which are now seen as "classics", but with disgusting hidden and not so hidden PRO-COMMIE themes and many of them are really quite old.
Everyone involved with that movie was blacklisted, and Jack Warner disowned it and made the anti-commie Miracle of Lady of Fatima in atonement.