Research into the history of anarchism as a transnational movement has been remarkably dynamic since the mid-2000s, uncovering or revisiting rich individual and collective histories of mobilities and exchange, and making a significant theoretical contribution to the transnational turn in the humanities and social sciences. In return, the study of anarchism has been reinvigorated by the new perspectives afforded by transnational approaches, which have opened up new territories for empirical study and allowed a much finer understanding of the movement’s political, social, and cultural history, and the nature and scope of anarchist internationalism and national attachments, as well as of anarchism’s relationship with labour organizations – to name just a few key areas.