The panorama of terrorism comprises not only prominent groups such as al-Qaeda and the so-called Islamic State (ISIS), but also webs of relationships among these organizations and their lesser-known allies. Around the world, terrorist groups team up for joint attacks, training, and even moral support. Although such cooperation has occurred for decades, it is only in the past several years that a wave of research on the subject of terrorist group alliances has emerged. Tricia Bacon’s scholarship, including this article, is an important part of this body of work.

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