Also recommend reading “The Nked Socialist” by Paul B. Skousen
Yang and Snyder’s book are better than the Black Book of Communism, in that they are more specific. analytical and have no liberal European pretense/bias, which in my opinion, Stephane Courtious has.
Also The Forsaken by Tzouliadis, about American dupes who went to Russia for work in the Depression. A very bad move, for them and especially their families.