Interesting, is there anywhere I can read about this aside from the book you've linked? Although I am a Communist, I am critical of the Bolsheviks and I have an open mind.
I think there's a documentary on Neflix UK. The cover some of it. I would suggest looking at Ukrainian sources --but generally speaking, my understanding is you can find much of the information in Russian archives as the Soviets kept good records thinking those would never see the light of day.
