This volume has presented eight case studies of popular intellectuals on different continents who reflected on society in order to change it. They cover a broad range of people whose activist intellectual work has made a difference: from college-educated environmentalists to autodidact revolutionaries, from indigenous activists to Islamic fundamentalists. We believe there are good reasons to bring together these different historical actors, precisely because there is gain in this diversity: each article highlights specific themes that provide valuable insight in the social dynamics of ideological work. Here, we bring together a selection of these insights and explore, at the same time, how a focus on popular intellectuals allows us to better understand some salient aspects of social contention.