Renowned philosopher Leszek Kolakowski was one of the first scholars to reveal both the shortcomings and the dangers posed by communist regimes. He now presents, for the first time in one paperback volume, his definitive Main Currents of Marxism: "A prophetic work," according to the Library of Congress, that provides "the most lucid and comprehensive history of the origins, structure, and posthumous development of the system of thought that had the greatest impact on the 20th century."