High Noon's plot can be seen as an allegory for McCarthyism and the Red Scare. The writer, a former Communist party member, refused to name names.
[High Noon is] the most un-American thing I’ve ever seen in my whole life. - John Wayne.
John Wayne supported blacklisting and disliked the anti-Red Scare theme of the film.
I made Rio Bravo because I didn't like High Noon. Neither did Duke (John Wayne). I didn't think a good town marshal was going to run around town like a chicken with his head cut off asking everyone to help. And who saves him? His Quaker wife. That isn't my idea of a good Western. - Howard Hawks
Chaplin was denied re-entry into the United States because he was considered too progressive by the government. This film is Chaplin's critique of McCarthyism.
Kim Jong-il kidnapped a South Korean director and his actress wife and forced them to make Pulgasari, in which the titular giant monster symbolizes capitalism.
I haven't seen it yet, but I hear "Satantango" is about communism