Most of the anti-commie movies of the ‘50s — My Son John, Big Jim McClain, I Married A Communist, I Was A Communist For The FBI — were pretty awful. The best of these were probably the films of Samuel Fuller, notably Pickup On South Street.
Also notable is Man On A Tightrope, directed by Elia Kazan right after he testified before HUAC (and just before he made On The Waterfront). Although forgotten today, it was one of the better films in this group, perhaps because it was more of an escape thriller than political tract.
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.