Earlier quoted context omitted.
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If the comparison is the Holocaust and Gulags, you know yoy're near rock bottom
Nazis: ~6 million
Soviet Union: ~20 million
China Cultural Revolution: ~30 million
Though the Soviet Union and China ones were more of a result of incredibly bad economic policies. The Soviets still killed ~1-2 million in Gulags directly.
Let’s also not forget the Japanese genocides against China. Nanjing, Unit 731…
There also is, of course, more recent ones that are little known. Cambodia took over a million and Rwanda close to that.