"The international communist movement has had a profound impact inupon the modern world. In the half-century since the Bolshevik Revolution the movement has expanded steadily. Communist parties now rule in fourteen countries and are active in some 75 others. At the same time, the movement has become more complex and fragmented, particularly as divergent tendencies have arisen in the past dozen years. For these reasons, the Hoover Institution decided to begin publication of a Yearbook on International Communist Affairs, a project designed to provide an annual compendium and reference work for scholars, teachers, students, policymakers, journalists, and others."