Book excerpt: Very rarely disclosures of information from behind the Iron Curtain throw new light on the roots of communist thought and action and challenge accepted notions on the operation of the communist system. We believe that this book does both these things. It is nothing if not controversial. It rejects conventional views on subjects ranging from Khrushchev's overthrow to Tito's revisionism, from Dubcek's liberalism to Ceausescu's independence, and from the dissident movement to the Sino-Soviet split. The author's analysis has many obvious implications for Western policy. It will not be readily accepted by those who have for long been committed to opposing points of view. But we believe that the debates it is likely to provoke will lead to a deeper understanding of the nature of the threat from international communism and, perhaps, to a firmer determination to resist it.