Honor among Thieves: Understanding Rhetorical and Material Cooperation among Violent Nonstate Actors

Christopher W. Blair, Erica Chenoweth, Michael C. Horowitz, Evan Perkoski, Philip B.K. Potter

Research output: Contribution to journalArticlepeer-review

11 Scopus citations


Cooperation among militant organizations contributes to capability but also presents security risks. This is particularly the case when organizations face substantial repression from the state. As a consequence, for cooperation to emerge and persist when it is most valuable, militant groups must have means of committing to cooperation even when the incentives to defect are high. We posit that shared ideology plays this role by providing community monitoring, authority structures, trust, and transnational networks. We test this theory using new, expansive, time-series data on relationships between militant organizations from 1950 to 2016, which we introduce here. We find that when groups share an ideology, and especially a religion, they are more likely to sustain material cooperation in the face of state repression. These findings contextualize and expand upon research demonstrating that connections between violent nonstate actors strongly shape their tactical and strategic behavior.

Original languageEnglish (US)
Pages (from-to)164-203
Number of pages40
JournalInternational Organization
Issue number1
StatePublished - Mar 3 2022
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Sociology and Political Science
  • Political Science and International Relations
  • Organizational Behavior and Human Resource Management
  • Law


  • Militant alliances
  • cooperation
  • counterterrorism
  • ideology


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