The Soviet-German War of 1941-1945 was the most extensive intelligence/counterintelligence war in modern history, involving the capture, torture, deportation, execution, and "doubling" of tens of thousands of agents--most of them Soviet citizens. While Russian armies fought furiously to defeat the Wehrmacht, Stalin's security services waged an equally ruthless secret war against Hitler's spies, as well as against the Soviet population. For the first time, Robert Stephan now combines declassified U.S. intelligence documents, captured German records, and Russian sources, including a top-secret...