The people before us weren't perfect. Their mistakes are blueprints to learn from and build a better world
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The Women's Liberation and Gay Liberation Movements by Huey P. Newton
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Transgender Liberation: A Marxist View by Leslie Feinberg
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The Problem of Recognition in Transitional States, or Sympathy for the Monster by Nia Frome
These are all great places to start for Marxist views on the LGBTQIA+ movement. Trans rights are human rights.
For an intro to Marxism-Leninism in general, I wrote this basic study guide.