I found it remarkable that thousands of Gulag prisoners were writing letters to Stalin thinking that Stalin did not know of the conditions in which these inmages were living nor the reasons they were sent there..they actually thought that Stalin himself was such a saint that he could not possibly be directly responsible for the people being imprisoned in the Gulag.
I also found it interesting that Stalin himself spent the wee hours of the morning going over the lists of those to be executed and approving them, even adding comments like "Add 6,000 more, not enough"
The near 100% mortality rate for the mines of Kolyma near the Arctic circle was amazing...that word would literally send shivers down a civilian spine, since it was a sure death sentence.
What a nightmare for the civilians of the Soviet Union.