Hope this is the right forum for this question.
About 10-15 years I came across a discussion/text. In this there was an argument, that zombie stories were a metaphor for the (capitalist) fear of communists, and vampire stories a metaphor for (communist) fear of capitalists.
I believe there were examples comparing left demonstrators with zombie hordes and vampires with investors. Also something how the conversion works. Zombies creating an equal while vampires servants or lower vampires.
I thought this would be an easy online search, but was unable find a source. I could locate Zombies of Karl Marx... - but that was written in 2018.