During the 1940s, Barr and Sarant worked on classified radars and other military systems at Western Electric and Sperry Gyroscope, two leading American technology firms. Unlike others in the Rosenberg ring, Barr and Sarant didn’t possess nuclear weapons secrets, but they had gained intimate knowledge about the electronics in new weapons systems. In the late 1940s, as the FBI began unraveling the KGB’s spy networks in the U.S., Rosenberg was tried and sentenced to death by electrocution alongside his wife, Ethel. Before the FBI could catch them, Sarant and Barr fled the country,
