The Spy Who Changed History: The Untold Story of how the Soviet Union Won the Race for America’s Top Secrets by Svetlana Lokhova
This is a well researched account of science/technology espionage in the US in the 1930s. It focuses on one agent Stanislav Shumovsky who openly enrolled as an aeronautical engineer at MIT. Along with a number of other Russian students he gained considerable access to a range of industrial/military secrets interacting with the legal and hidden espionage operatives.
It covered something of Trotskyist opposition in the US in the 1930s which was interesting.