It was my belief in these values [``basic scientific truths and human values''] that put me behind the barbed wire of Hitler's concentration camps. My final thoughts go to those who, like myself, were passing through that inferno of total terror. Among them, some hoped for a great turning of the tables which would make them guards and masters where formerly they had been inmates and victims. They objected, not to the totalitarian means, but to the ends for which they were being used.Others responded differently. They asked me, if ever opportunity offered, to explain to all who would listen the inhumanity of totalitarian rule in any form. Over the years and more than I can express, these men have inspired my search for a deeper understanding of the nature of total power. [p. v]