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Start with "When Serfs Stood Up in Tibet". It sounds counter-intuitive to start with such a late work of hers on a relatively niche topic, but you can read about the Soviet Union, Stalin, Mao, etc. elsewhere too, whereas When Serfs Stood Up is really unique in that it was the first firsthand western account of Tibet right in the immediate aftermath of its liberation, and it showcases a lot about how communists should strive to approach building a new society.