Abstract While research on transnational advocacy networks (TANs) is well established in international relations, knowledge gaps remain concerning TAN collaboration across policy fields. To address this gap, this article highlights how super-networks (networks above individual TANs) emerge across issue areas and explores the tactics utilized to achieve their objectives and shape international agreements. We develop an analytical framework that emphasizes the important interplay between political opportunity structures, mobilizing structures, and tactics in understanding how super-networks operate. We apply this framework via a comparative case study approach, analyzing the Inter-Constituency Alliance, whose advocacy brought about the inclusion of human rights language in the 2015 Paris Climate Agreement, and the International Campaign for the Abolition of Nuclear Weapons, whose activities based on humanitarian principles resulted in the 2017 Treaty on the Prohibition of Nuclear Weapons. Contributing new knowledge to TANs research, we identify that super-networks utilize multilevel advocacy activities that draw upon a package approach tactic. Via the package approach, super-networks synthesize multiple voices from different issue areas into one key message grounded in humanitarian framing, thereby enhancing their moral leverage and legitimacy, making it more difficult for states to neglect their concerns.
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