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What brings different terrorist groups, organizations that are regularly secretive and competitive, to collaborate with one another? We build on scholarship that identifies ideology as a determining feature of terrorists' behavior and draw on network studies that emphasize the role of homophily in creating collaboration. We suggest that the groups' homophily in ideology plays a significant part in terrorists' collaboration. Using network analysis, we examine collaborations across three case studies and different time frames: Pakistan, Colombia, and Italy. Our findings suggest that homophily in ideology is indeed a key predictor for collaboration yet that it also changed over time.
Swed et al. (Sun,) studied this question.