The major difference between Hitler and the Communist genocidal murderers –Stalin, Mao and Pol Pot –was what groups they chose for extermination. For Hitler, first Jews and ultimately Slavs and other "non-Aryans" were declared the enemy and unworthy of life. For the Communists, the rich –the bourgeoisie, landowners and capitalists –were labeled the enemy and regarded as unworthy of life. Hitler mass-murdered on the basis of race, the Communists on the basis of class. Because the Holocaust was unique in its industrialization of death and in its targeting of every Jew, including babies, for death, the post-World War II world...