account of the consequences of Stalin's leadership of the USSR from the 1905 split to the revolution itself, the worker's opposition, Lenin's death, industrial and literary debates, collectivisation, the successive witch-hunts for underground Menshevik organisations followed by the Japanese / German / French / Tsarist agents in the upper echelons of the state apparatus.
This is, as far as I understand, one of the first works published in the USSR which went as far as it did in saying that the Purges not only did not follow legal procedures, but that torture was used, and that many of the accusations were completely fabricated; even if others had said Stalin might have gone overboard and made certain mistakes no-one had said this was all caprice and paranoid gangsterism.
I also understand that significant amounts of the primary data was obtained from the victims and families of the victims, who managed to get their accounts of what was happening to the author. In order to make this stuff really hit Medvedev quotes from them at length; underlines again how successfully Victor Serge channelled the sublimated romanticism and pragmatic nihlism at work in the mentalité of your average functionary of the epoch.
No shortage of particularly outrageous sections: arrests and executions of German communists who had fled Nazism, the shafting of Greece, Bukharin's last testament, both moving ('Remember, Comrades, that on the red flag you carry on the victorious road toward communism lies a drop of my blood as well'), but also a bit shameful for its seeming elision of his standing by while friends were pulled under the wheels before him. What a reckless, senseless and pointless waste of human, intellectual and cultural resources
tldr how about this Stalin guy