a number of former cia officials left the agency, and wrote books critical of its activities. john stockwell, who had headed the cia operation in angola, resigned, wrote a book exposing the cia's activities, and lectured all over the country about his experiences. david macmichael, a historian and former cia specialist, testified at trials on behalf of people who had protested government policy in central america. fbi agent jack ryan, a twenty-one-year veteran of the bureau, was fired when he refused to investigate peace groups. he was deprived of his pension and for some time had to live in a shelter for homeless people. what do all these cases refer to?