Fighting Germany's Spies

The narrative reconstructs how wartime counterintelligence uncovered and prosecuted a broad German espionage campaign in the United States, drawing on official files and verified documents. It follows investigations into passport frauds, the Werner Horn affair, ship-bomb plots, coded communications, a chemical spy, and a German-Hindu conspiracy, revealing techniques such as forgery, sabotage, blackmail, and cipher use. It details government responses, including enlargement of investigative forces, new legal measures, prosecutions, and internment of dangerous aliens, alongside cooperation with private patriotic organizations. Individual case studies presented through telegrams, confessions, and trial records illustrate how concerted investigatory work disrupted plots and secured convictions.