The Italian philosopher Giorgio Agamben is having an increasingly significant impact on Anglo-American political theory. His most prominent intervention to date is the powerful reassessment of sovereignty and the politics of life and death laid out in his multivolume "Homo Sacer" project. Agamben argues that in both the modern world and the ancient, politics inevitably involves a sovereign decision that bans some individuals from the political and human communities. For Agamben, the Nazi concentration camps in which some inmates are reduced to a form of living death are not a political...