Understanding Adolf Hitler’s ideology provides insights into the mental world of an extremist politics that, over the course of the Third Reich, developed explosive energies culminating in the Second World War and the Holocaust. Too often the theories underlying National Socialism or Nazism are dismissed as an irrational hodge-podge of ideas. Yet that ideology drove Hitler’s quest for power in 1933, colored everything in the Third Reich, and transformed him, however briefly, into the most powerful leader in the world.How did he discover that ideology? How was it that cohorts of leaders, followers, and ordinary citizens adopted aspects of National Socialism without experiencing the leader first-hand or reading his works? They shared a collective desire to create a harmonious, racially select, community of the people to build on Germany’s socialist-oriented political culture and to seek national renewal. If we wish to understand the rise of the Nazi Party and the new dictatorship’s remarkable staying power, we have to take the nationalist and socialist aspects of this ideology seriously. Hitler became a kind of representative figure for ideas, emotions, and aims that he shared with thousands, and eventually millions, of true believers who were of like mind . They projected onto him the properties of the necessary leader, a commanding figure at the head of a uniformed corps that would rally the masses and storm the barricades. It remains remarkable that millions of people in a well-educated and cultured nation eventually came to accept or accommodate themselves to the tenants of an extremist ideology laced with hatred and laden with such obvious murderous implications.