By John V. H. Dippel
During World War II, the United States benefited greatly from the espionage collaboration between a well-connected ex-professor of economics, Erwin Respondek, and his contact at the U.S. embassy in Berlin, Sam Woods. The intelligence gathered by Respondek and passed on to the U.S. government included the first detailed and accurate warning about the Germans' plans to invade the Soviet Union in 1941. It also included valuable information about German atomic research, military operations, and "secret weapons." This espionage work--here described for the first time--forms an intriguing chapter in the history of U.S. intelligence operations during the war.