Book excerpt: Boris Souvarine moved from communism, in the first years of the Soviet régime, to anti-communism by the 1930s and throughout the rest of his long life. This book gives us a new and original perspective on the period that runs from the Russian Revolution to the 1950s and allows us to better understand that era. The documents come from the Boris Souvarine Collection consisting of his working notes, press clippings, and documentation concerning East-West relations collected by Souvarine.