Though largely unknown to the English-speaking world, the Austro-Marxist school of thinkers offered a number of essential theoretical insights into the issues faced by the burgeoning socialist movement of their time. This illuminating volume collects the most important works of the key figures from this school-Otto Bauer, Max Adler, Karl Renner, Friedrich Adler, Rudolf Hilferding, and Otto Neurath-and historically situates their contributions through brief biographical sketches, making them accessible to English speaking readers for the first time.