In revolutionary struggles, large numbers of people try to transform politics and society in fundamental ways, including in the remaking of constitutions. Often dismissed as symbolic at best, constitutions become critical sites of contention and eventual markers of change in the aftermath of regime overthrow, where multiple groups seek to change (or preserve) a country’s long-reigning power blocs and institutions. In this study, I examine the constitutional campaigns of Egyptian and Tunisia labor movements from 2012-2013, namely “The Workers and the Peasants Write the Constitution” campaign in Egypt and around “the National Dialogue” in Tunisia. I ask: (1) What did the labor movements envision, respectively, as their desired alternatives? and (2) What explains their impacts on formal constitution-making? This paper relies on interview, archival, and newspaper data, alongside draft constitutional texts and reports on collective actions. It finds that the campaign in Egypt sought the more ruptural transformation, modeling associational and direct democratic forms while advocating an inclusive, if uncertain, participatory socialism. By contrast, the UGTT’s campaign envisioned social democratic statist economic regulation with a heavy dose of liberal democracy. Tunisian organized labor would breach formal national constitution-making, where they dropped key social democratic institutions, whereas Egyptian independent labor fell flat, never really having the chance to negotiate. I argue that rather than organizational legacies alone, critical to the divergence in both the visions and impacts is an organized disruptive capacity (or lack thereof) that enables labor to build societal power in broad-based coalitions, the presence or absence of which animated these specific campaigns. In doing so, the paper addresses arguments that separate out the effects of class structure and social movement factors. Yet rather than mechanically aggregating separate features or capacities, the argument is about how a set of movement power resources can combine in particular ways to shape the content and related outcomes of constitutional campaigns.