Does leadership targeting work? This question lies at the heart of studies on the efficacy of counterterrorism policy. This book examines whether killing or arresting terrorists is an effective means by which to weaken and degrade a group’s operational capacity. It aims to identify and explain why decapitation works in some cases and not in others. In order to determine whether decapitation is an effective strategy, this project examines nearly one thousand instances of leadership targeting. A group’s susceptibility to leadership targeting is a function of three factors: organizational structu ... More

Does leadership targeting work? This question lies at the heart of studies on the efficacy of counterterrorism policy. This book examines whether killing or arresting terrorists is an effective means by which to weaken and degrade a group’s operational capacity. It aims to identify and explain why decapitation works in some cases and not in others. In order to determine whether decapitation is an effective strategy, this project examines nearly one thousand instances of leadership targeting. A group’s susceptibility to leadership targeting is a function of three factors: organizational structure, communal support, and group type or ideology. Leadership decapitation is unlikely to result in the demise of groups that are highly bureaucratized, have high levels of communal support, or are driven by a religious or separatist ideology. Leaders matter less under these conditions, and their removal can have adverse consequences, such as retaliatory attacks or an overall increase in the frequency of attacks. The data reveals that the largest and oldest organizations are highly resistant to destabilization after targeting. Separatist, religious, and especially Islamist groups are unlikely to weaken after the removal of their leaders. In order to develop counterterrorism policies that will degrade and weaken terrorist organizations, it is essential to identify whether our policies are likely to be effective or to have adverse consequences. The book examines the cases of Hamas, al-Qaeda, Shining Path, and ISIS to understand how organizational structure, local support, and ideology contributes to their resilience in the face of repeated leadership attacks.