John Stockwell, who publicly resigned from the Central Intelligence Agency in 1977, accusing it of deceit and illegality, after a career as a covert operative in Vietnam and Africa, died this month in Austin, Texas. He was 88. .... Mr. Stockwell’s break with the C.I.A. — during a period when several former officers published damning exposés of what was informally known as “the Company” — was public and showy. His resignation letter ran in The Washington Post. He wrote a tell-all book, “In Search of Enemies” (1978), which the C.I.A. sought to suppress. He was interviewed on the CBS news...