How do the norms of the liberal international order influence the activity of Islamist movements? This book assesses the extent to which Islamist groups, which have traditionally attempted to shield their communities from 'external' moral conceptions, have been influenced by the principles that regulate international society. Through an analysis of Lebanon's Hezbollah, Filippo Dionigi concludes that international norms are significant factors changing Islamist politics. We are still far from an accomplished resolve of the tension between Islamist communitarianism and liberal normative views, but a precarious equilibrium may emerge whereby Islamists are persuaded to rethink the idea of an allegedly 'authentic' Islamic morality as opposed to the legitimacy of international norms.