During the Cold War a number of high-ranking Soviet citizens spied for the CIA, providing the United States with valuable information while putting themselves and their families in great danger. In this book a seasoned CIA field operator and station chief looks at what drove these agents to betray their own country. Unlike many authors who write about spies, John Hart knows the espionage profession first-hand, and his penetrating analysis of the motivations involved is based on top-secret operational files. Four major Soviet agents - Yuri Nosenko, the dissident KGB agent who disclosed the bugs