Men and Citizens in the Theory of International Relations deals with the tension between the obligations of citizenship and the obligations of humanity in modern theories of the state and international relations. It contains an historical overview of the way in which the relationship between citizenship and humanity has been conceived in political theory since the seventeenth century. Drawing upon the German idea of freedom developed in the writings of Kant, Hegel and Marx, Men and Citizens argues for the primacy of obligations to the human race. A postscript to this new edition provides a commentary on the writings of Habermas and Foucault. The line of argument developed in the first edition is reconsidered in the light of the current debate between critical theorists and anti-foundationalists. The case for a critical sociology of moral boundaries in international relations is presented in the final sections of the book.