This database is the result of a collaborative project that brings together years of experience in the field of activism (Srdja Popovic) with scholars (Sophia A. McClennen and Joseph Wright) who work in human rights, democratization, autocracy, and the social effects of humor. Popovic received Penn State's McCourtney Institute for Democracy's Brown Democracy Medal in 2020 for research he conducted with Sophia McClennen on the efficacy of a specific nonviolent activist tactic: the dilemma action, which puts opponents in a lose-lose position. That research led to Pranksters vs. Autocrats: How Dilemma Actions Advance Democracy (Cornell University Press, 2020). McClennen and Popovic then teamed up with Wright to expand their research findings, offering an observational study of the comparative efficacy of nonviolent campaigns that use creative tactics and ones that do not. Collecting original data on dilemma actions during nonviolent activist campaigns, we found that roughly one-third of mass nonviolent campaigns in the past century deploy this strategy. We then theorized four mechanisms linking dilemma actions to nonviolent activist campaign success: facilitating group formation, delegitimizing opponents, reducing fear, and generating sympathetic media coverage. Finally, we assessed whether dilemma actions increase campaign success rates, finding that dilemma actions are associated with an increase of 11-16 percent in activist-campaign success. That research was published in the Journal of Democracy in January 2023 as, “How to Sharpen a Nonviolent Movement.” This website offers an even larger dataset of examples of dilemma actions and includes cases from a far wider set of political struggles and core issues. This website was funded by a grant from Penn State's Center for Humanites and Information.