" These people, who had experienced on their own hides twenty-four years of Communist happiness, knew by 1941 what as yet no one else in the world knew: that nowhere on the planet, nowhere in history, was there a regime more vicious, more bloodthirsty, and at the same time more cunning and ingenious than the Bolshevik, the self-styled Soviet regime. That no other regime on earth could compare with it either in the number of those it had done to death, in hardiness, in the range of its ambitions, in its thoroughgoing and unmitigated totalitarianism—no, not even the regime of its pupil Hitler, which at that time blinded Western eyes to all else. "

― Aleksandr Solzhenitsyn , The Gulag Archipelago, 1918-1956: An Experiment in Literary Investigation, Books V-VII