When Organizations Join Forces: Introducing the Terrorist Umbrella Alliances Dataset 

While a significant amount of scholarship has explored the effects of terrorist group alliances on the lethality, resiliency, and longevity of terrorist groups, the primary focus has been on dyadic relationships or networks of affiliates. An area that remains largely unexplored is the formation of terrorist umbrella alliances, principally due to a lack of comparable data on the emergence of these groups across armed conflicts over time. To fill this gap, I present the Terrorist Umbrella Alliances Dataset, which offers information on the formation, structure, membership, and activities of terrorist umbrella alliances, both domestic and transnational, that were active between 1970 and 2020. The dataset opens several avenues for conflict research, including the structures of umbrella alliances, how umbrella alliances shape peace processes with the government, interactions among umbrella-members compared to non-members, and the politics of postwar governance, among others.