Joseph M. Brown
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Force of Words: The Logic of Terrorist Threats (Columbia University Press 2020)

This book is the first detailed study of the role of threats in terrorism. Threats and violence are the two halves of terrorists’ coercive tool kit: terrorists carry out violence to lend credibility to their future threats; threats force governments and civilians to give up political concessions. Most terrorism literature focuses on the violent half of terrorists’ tool kit, but threats are how terrorists translate physical power into political results. 

Force of Words is a groundbreaking contribution to the fields of terrorism studies and security studies. It shows how terrorists use threats to achieve major strategic goals such as policy concessions and social control. It also shows how terrorists employ threats for tactical purposes, 
drawing security forces into traps, disrupting economic life, and warning civilians away from danger. Terrorists use threats to tailor the harm from each attack so that their desired political message is sent. Drawing on rich interview data, quantitative evidence, and case studies of the IRA, ETA, the Tamil Tigers, Shining Path, the Túpac Amaru Revolutionary Movement, Boko Haram, the Afghan Taliban, and ISIL, Force of Words offers practical guidance for interpreting terrorists’ threats and assessing their credibility.