In the turbulent period in which the international socialist movement was torn between the re-organised Second International and the newly-formed Third International, Austro-Marxism was involved in the formation of the Second-and-a-half International, forging a path “between terrorist Moscow and impotent Bern”. This search for a third way between the social democratic and communist traditions rose and fell and took many forms through the decades up to our times. This paper explores the key ideas and manifestations of this trajectory and my own engagement with it at crucial turning points.