Terror and the loss of citizenship

Terror in the name of God and the specter of returning fighters for the so-called ‘Islamic State’ have recently moved some Western states, including Britain, Canada, and France, toward revoking the citizenship of terrorists. To critics, this constitutes a ‘return to banishment,’ a ‘fate universally decried by civilized people,’ as an American Supreme Court Chief Justice put it in the late 1950s. In a double reflection on the changing nature of terror and of citizenship, this paper argues that denationalization is, in principle, the adequate response to terror. This is because terror, particularly of the Islamist kind, is no ordinary crime but attack on the fundaments of citizenship. But what is right in principle may not be the right thing to do, because denationalization raises serious practicality problems.