So the US imprisons less people than China, something to be proud of. As for Stalin, you do realise that most of the people who died did so in the forced labor camps known as gulags? I recommend reading The Gulag Archipelago by Aleksandr Solzhenitsyn. Gulags stretched across 12 times zones. During the great purge, before the second world war, Stalin's NKVD (which would become the KGB) was responsible for the deaths of less than 2 million people, after the war the Gulag system was set up, and the great imprisonment began. A substantial percentage of those imprisoned died there.
People are getting a bit het up about 'police state', but seem to be willfully ignoring that what I actually said was that 'it looks, to all intents and purposes, like a surveillance/police state'.