A four-volume account of the history and evolution of U.S. Counterintelligence that was prepared for the now-defunct National Counterintelligence Center (NACIC). The encyclopedic 1500 page work begins with an account of counterintelligence (CI) from the American Revolution to World War II (volume 1), proceeds with a study of CI in World War II (volume 2), continues with a survey of the post-WWII atom bomb spies up to the latest espionage cases (volume 3), and concludes with a look at current counterintelligence challenges from China, Russia and elsewhere (volume 4). The study, prepared over several years by multiple authors, deals in part with well-trodden ground such as the Venona intercepts. But it also includes extended treatments of much more obscure topics, such as counterintelligence in the Civil War, and official accounts of numerous individual espionage cases that never made headlines, as well as a U.S. government perspective on "counterintelligence in the turbulent 1960s and 1970s." --