Bill Moyers's interview with the historian and activist Howard Zinn is at its best when autobiographical. The author of A People's History of the United States (1980), one of the most influential radical works of the past half century, remains, in his eighties, a warm and compelling observer and critic of social injustice and war. Moyers focuses considerable attention on the ways in which Zinn's World War II bombardier experiences shaped his postwar commitments. Zinn is at his best in describing how, at thirty thousand feet, one does not hear the screams of one's victims. ...