There is a fairly interesting article on the Kaiju Fan Website (Kaiju is the Japanese term for a giant monster ala Godzilla) centering on the symbolism of communist encroachment in the classic Toho film Frankenstein Conquers The World entitled Frankenstein Conquers Communism.

In the article, the author suggests that the giant Frankenstein Monster's villainous nemesis Baragon represents "the threat of International Communism. Look at his characteristics. He burrows underground, sneaking about unseen. Yet he is a large and menacing danger, causing grave damage to things like oil fields, farms, and oh yes, resorts full of gullible young people. And after causing all this destruction he vanishes without a trace, just like the communist underground of our fevered imagination, an underground full of moles, saboteurs, and propagandists."