The nature and conduct of international politics has changed dramatically since the Cold War. Yet much of the literature on deterrence and compellence has not kept pace. In their new book, Coercion: The Power to Hurt in International Politics (Oxford University Press, 2018), co-editors Peter Krause of Boston College and Kelly M. Greenhill of Tufts University seek to expand the understanding of coercion for conflict in the 21st century. Contributing authors address tools (terrorism, sanctions, drones, cyber warfare, intelligence, and forced migration), actors (insurgents, social movements, and NGOs) and mechanisms (trilateral coercion, diplomatic and economic isolation, foreign-imposed regime change, coercion of nuclear proliferators, and two-level games) that have become more prominent in recent years. Krause, an associate professor in the Political Science Department, contributed a chapter on “Coercion by Movement: How Power Drove the Success of the Eritrean Insurgency, 1960-1993” and Political Science Department colleague Timothy Crawford contributed the chapter “The Strategy of Coercive Isolation.” Krause is also the author of Rebel Power: Why National Movements Compete, Fight and Win.