There was an especially good anti red movie made right after the blacklist. I think it was with Dana Andrews and concerned that terrified Soviet clerk, Igor Gouzenick (sp).
I remember a Dana Andrews film about an advertising agency taken over by Reds, or something like that. Called “The Fearmakers,” I believe. From around 1958. Probably not the film you’re citing, but definately anti-commie.
I just saw that movie recently it called “The Iron Curtain”.
He played a Soviet who defected during the war in Canada.
He also did a radio show called “I Was a Communist for the FBI”, I have listened to show on SiriusXM, great show.