- ISBN: 9780486454504 | 0486454509
- Cover: Paperback
- Copyright: 3/14/2008
When Marx declared religion the opium of the people, he voiced a central tenet of the philosophy that bears his name. In this collection of essays and letters, the founders of Marxism discuss the origins and essence of religion, offering a thought-provoking introduction to the theoretical basis of proletarian atheism.