Well-illustrated, pithy and informative, this article will get you up to speed on some of the espionage triumphs of the Soviet GRU (the military intelligence arm of the former "worker's paradise"). The article refers to where their agents trained before their American and Canadian deployments, what they were taught, and how big the GRU was. Of even greater interest were the parts of the article that referred to their "Atomic spies" and the variety of traitors and turncoats they were able to attract.
Additional magazine and newspaper articles about Cold War spies can be read on this page.