This work explains the nature of constitutional rights. It does so by means of an analysis of the nature of law in general, the nature of constitutions, and the nature of rights. It looks in detail at several aspects of constitutional law, rights and institutions, as well as aspects related to public officials, private persons and associations. In addition, the book critically examines a considerable number of debates about whether some actual or proposed constitutional rights ought to be established and maintained in the United States constitution. It then identifies the kinds of reasons that justify or fail to justify constitutional rights. The book advances the debate and makes a contribution to the theory and the practice of constitutional rights.