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Deportation of Wolga Germans based on ethnicity instead if class
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Outlawing homosexual partnerships between men
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That he didn't support the popular front in the Spanish civil war more
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Stopping after Berlin
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Stopping before Tokyo
Only the first 2 are big mistakes imo
Great leader overall
Definitely worth checking out, he's a English literature professor at the Michigan state university.
He learned Russian and studied the Soviet archives for a decade, his main conclusion are that Kruschevs speech was a bunch of lies and that the Moscow trials were legit, Trotsky did indeed collaborate with Nazis and Japan