Throughout the entire 20th century, the assessment of the Soviet Union has directly or indirectly dominated a large part of leftist debates. Since the October Revolution of 1917, the so-called "Russian Question" has been one of the main points of contention in every radical debate for over seventy years. Historian Marcel van der Linden has compiled seven classic leftist texts that critically address the existence of the Soviet Union. Introductory contributions from the editor about the authors and their political and academic contexts make this volume a treasure trove for anyone who wishes to engage with the experiment of actually existing socialism, even after the collapse of the Soviet Union.