Cassidy's Run is the riveting story of one of the best-kept secrets of the Cold War--an espionage operation mounted by Washington against the Soviet Union that ran for twenty-three years. At the highest levels of the government, its code name was Operation shocker. Lured by a double agent working for the United States, ten Russian spies, including a professor at the University of Minnesota, his wife, and a classic 'sleeper' spy in New York City, were sent by Moscow to penetrate America's secrets. Two FBI agents were killed, and secret formulas were passed to the Russians in a dangerous ploy that could have spurred Moscow to create the world's most powerful nerve gas. Cassidy's Run tells this extraordinary true story for the first time, following a trail that leads from Washington to Moscow, with detours to Florida, Minnesota, and Mexico. Based on documents secret until now and scores of interviews in the United States and Russia, the book reveals that: , more than 4,500 pages of