The term "Pentagon Papers" has entered the language, but we may have forgotten that the papers in question were a study commissioned by Secretary of Defense Robert Strange McNamara on the background to the United States' involvement in Vietnam. It was Mr. Ellsberg who in 1971 had turned the secret papers over to the Washington Post and the New York Times; the Supreme Court had ruled that the newspapers had the right to publish them, but, as Mr. Buckley phrases it, "that decision ... did not derivatively exonerate those who gave the classified material" to them, and at the time of this show, Mr. Ellsberg was on trial. To Mr. Buckley's first question--whether his guest had immunity for anything he might say in the next hour--Mr. Ellsberg replies: "Well, you haven't come to an expert. I'm a beginner at being a defendant, and all I know is what I've heard in court, really." The discussion begins calmly enough with consideration of the Espionage Act, but once we get to Vietnam, we're off to the races.