Carl Schmitt ranks among the most original and controversial political thinkers of the twentieth century. His incisive criticisms of Enlightenment political thought and liberal political practice remain as shocking and significant today as when they first appeared in Weimar Germany. Unavailable in English until now, Legality and Legitimacy was composed in 1932, in the midst of the crisis that would lead to the collapse of the Weimar Republic and only a matter of months before Schmitt’s collaboration with the Nazis. In this important work, Schmitt questions the political viability of liberal constitutionalism, parliamentary government, and the rule of law. Liberal governments, he argues, cannot respond effectively to challenges by radical groups like the Nazis or Communists. Only a presidential regime subject to few, if any, practical limitations can ensure domestic security in a highly pluralistic society.