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> marxist theory
Want to add: not that marxist theory in modern terms, but in Soviet style.
There were large institutions about so-called Marxism-Leninism, it was obligatory for everyone with education to have courses in political philosophy (pretty boring but who cares). Plenty of books were written, institutes established etc, only for studying these theories, and most works of people from that age have mark of this, sometimes hidden, but noticeable. Even when theory has mystical concepts, they often include some remarks in that marxist style (mostly about economics).
https://en.wikipedia.org/wiki/Dialectical_materialism
https://en.wikipedia.org/wiki/Historical_materialism
https://en.wikipedia.org/wiki/Scientific_communism