One event that was covered by both books was the relocation of a large number of Ukrainian to an island in a river in Siberia. They were dropped off with no food, clothes, tools or means to survive and told to chop wood. They didn't have any saws or axes. Most of the people died of starvation or exposure. Black Book did a better job of describing the event.
I was pretty much just making a follow-up joke about the Pulitzers, but I will look for the book.