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I Pledge Allegiance: The True Story of the Walkers – An American Spy Family by Howard Blum is a gripping true espionage account of the infamous Walker spy ring—one of the most damaging intelligence betrayals in U.S. history. This investigative non-fiction book reveals how John A. Walker Jr. recruited family members and associates into a covert Soviet spy network, exposing secrets of the Cold War era. Rich in real documents, interviews, and historical detail, this book is a must-read for fans of spy thrillers, Cold War history, military intelligence, and true crime nonfiction.