This book provides extensive details on the official Marxist philosophy of the Soviet Union, at least c. 1946 at it's publication. However, the author defends Soviet practices as well, and makes numerous empirical claims that do not have any supporting citations. Most of these seem, from what I am aware of, only partially accurate and in many cases gloss over human rights abuses which the author could have certainly been aware were occurring. This detracts greatly from the book, which does otherwise seem accurate regarding the philosophy presented.