There was a low-budget ‘50s film that was pretty good called HUK about fighting communists guerrillas in the Phillipines.
Brando’s THE UGLY AMERICAN was very anti-communist as was NICOLAS AND ALEXANDRA. Another low-budget ‘50s foreign film was THE RIVER CHANGES showing a village suddenly on the eastern European side of the river and the new authorities arriving to begin systematic oppression.
The Catherine Deneuve film EAST-WEST is perhaps the most powerful anti-communist and specifically anti-Stalin-era USSR film ever.
THE KILLING FIELDS despite its politically-correct U.S. guilt portrayals is still a powerful anti-communist film.
But my personal favorite is Alexander Solzhenitsyn’s FIRST CIRCLE which is really a brief mini-series produced by Canadian television.
Expertly done by a truly underrated director--Franklin J. Schaffner.