If the problem of determining the effect of specific types of propaganda on public opinion is difficult under the best conditions, it is almost impossible in a country like the Soviet Union, where the gauging of public opinion is in a rudimentary state. Nevertheless, Professor Powell gives a thoughtful and comprehensive analysis of the many aspects that condition the effectiveness of Soviet anti-religious propaganda. David Powell is Assistant Professor of Government and Politics at the University of Maryland. Q VER THE COURSE of nearly half a century, the Communist Party of the Soviet Union has endeavored to undermine the religious ties and inclinations of its citizens. Repressive actions against church officials, the introduction of laws limiting church power and religious proselytism, and the dissemination of atheist propaganda have all been aimed at diminishing the scope and relevance of religion in the U.S.S.R. It is not possible to gauge precisely how successful the regime has been in its efforts, nor is it possible to isolate the relative importance of propaganda in the over-all drive to create an atheist society. What we will do here is outline the principal strengths and weaknesses of anti-religious propaganda. Then, applying to the U.S.S.R. Western findings on opinion formation and opinion change, we will try to assess the effectiveness of Soviet propaganda. The question of how effective the Party has been in its effort to eliminate religion is clouded by uncertainty. No official statistics on church membership are published by Soviet authorities; indeed, the last official survey of religious belief was never published, apparently because it revealed the presence of too many believers.' Many of the available data are selective and ambiguous, for they are designed to be inspirational as well as informative. Refugee accounts and the observations of Westerners who visit the Soviet Union are not wholly reliable either, for they depend on isolated, superficial and perhaps unrepresentative experiences. Nevertheless, that religious belief is less widespread today than it was before the Bolshevik Revolution cannot be denied.2 No one source has yet revealed how many believers