I'm thinking about an "Osmosis Jones"-type story, but as an allegory for communism. Could show the potentially positive aspects in a human society (e.g., working towards a common goal) and the deleterious ones (e.g., subjugation of individual liberty, and even one's own life, in service of societal goals). Like, all of the cells (people) are working towards keeping the body alive, but it's the body of a rapacious murderer.

This doesn't extend to metaphors about individualistic society very well though: within a body, that kind of thing is typically cancer. Maybe that makes sense though *from* the communist perspective?