Since beginning publication in 1964, The Socialist Register has been one of the most important sources of engaged, critical, and influential theoretical interventions on the socialist left. Released as an annual with a focus on publishing rigorous, sustained pieces that take up particular themes, it has always been committed to developing an independent, nonsectarian relationship with Marxism. This volume - the Register's first-ever reader - grapples with the question of whether political organisation is a necessary part of the struggle by the working-class to overthrow capitalism. In pieces published over the course of publication's entire history contributors, from Ralph Miliband to Jean-Paul Sartre, examine various aspects of this theme.