What ideology did Stalinist totalitarianism develop out of ?
Among the most noted commentators on totalitarianism are Raymond Aron , Lawrence Aronsen , Franz Borkenau , Karl Dietrich Bracher , Zbigniew Brzezinski , Robert Conquest , Carl Joachim Friedrich , Eckhard Jesse , Leopold Labedz , Walter Laqueur , Claude Lefort , Juan Linz , Richard Löwenthal , Karl Popper , Richard Pipes , Leonard Schapiro , and Adam Ulam .