This handbook provides a broad overview of left-wing extremism and its associated key issues and themes. It breaks new ground by assembling in a single volume a comparative analysis of the phenomenon that is both multidimensional and multidisciplinary. Gathering a wide range of influential scholars who have worked at length in the field of extremism studies from different perspectives, backgrounds, and geographical settings, the Palgrave Handbook of Left-Wing Extremism presents an array of thought-provoking and innovative as well as informative analyses and discussions – both historical and contemporary - about the phenomenon of left-wing extremism and of how researchers conceive of and approach it in their study. The Handbook is designed to be, for the foreseeable future, the reference work for all students, researchers, and general readers interested in achieving a comprehensive understanding of left-wing extremism in all its manifestations, subtleties, and dynamics, and bothits current and its potential directions. Chapter “Radical Left Movements in Scandinavia, 1980–2020: Straddling Militant Counterculture and Popular Movements” is available open access under a Creative Commons Attribution 4.0 International License via SpringerLink.