This work presents perestroika as part of the continuum of European intellectual history. It examines the sources of Mikhail Gorbachev's thinking and action in 19th-century thought, the development of Russian Marxism through the intellectual crisis at the turn of the 20th century, the pragmatic and philosophical challenges to the Marxist-Leninist paradigm, Stalinism and its critics, and reform Communism in post World War II Eastern Europe. Against this background, the book argues that the decline and fall of Soviet Communism was much more deeply connected with ideological issues than most scholars have realized.