Engineering Communism is the fascinating story of Joel Barr and Alfred Sarant, dedicated Communists and members of the Rosenberg spy ring, who stole information from the United States during World War II that proved crucial to building the first advanced weapons systems in the USSR. On the brink of arrest, they escaped with KGB's help and eluded American intelligence for decades.

Drawing on extensive interviews with Barr and new archival evidence, Steve Usdin explains why Barr and Sarant became spies, how they obtained military secrets, and how FBI blunders led to their...