Considering the history of workers and socialist movements in Europe, Frontier Socialism focuses on unconventional forms of anti-capitalist thought, particularly by examining several militant-intellectuals whose legacy is of particular interest for those aiming for a radical critique of capitalism. Following on the work of Michael Löwy, Quirico & Ragona identify relationships of “elective affinity� between figures who might appear different and dissimilar, at least at first glance: the German Anarchist Gustav Landauer, the Bolshevik Alexandra Kollontai, the German communist Paul Mattick, the Italian Socialist Raniero Panzieri, the Greek-born French euro-communist Nikos Poulantzas, the German-born Swedish Social Democrat Rudolf Meidner, and the French social scientist Alain Bihr as well as two historical struggle experiences, the Spanish Republic and the Italian revolutionary group “Lotta continua�. Frontier Socialism then analyzes these thinkers and experiences’ respective paths to socialism based on and achieved through self-organization and self-government, not to build a new tradition but to suggest a path forward for both research and political activism.