As a kid I remember seeing THE RIVER CHANGES. It was a low budget and apparently Euro-made film about a town near the Iron Curtain that goes from West to East camp due to a change in the border river’s flow. The Commie bureaucrats and police arrive and start putting the town in order. They confiscated firearms too. The film ended with the townspeople fleeing across the river to the West.
The Duke and Audie Murphy both starred in anti-Commie flicks back in the 50s.
Unfortunately, The 1960s made the film industry safe for Marxists.