His first book, Ex-Communist Witnesses: Four Studies in Fact Finding (1962), discussed the testimony of four individuals involved in legal investigations into Communism in the United States: Whittaker Chambers, Elizabeth Bentley, Louis Budenz, and John Lautner.
Buku pertamanya, "Ex-Communist Witnesses: Four Studies in Fact Finding" (1962), membahas kesaksian dari empat orang yang terlibat dalam penyelidikan tentang Komunisme di Amerika Serikat, yaitu Whittaker Chambers, Elizabeth Bentley, Louis Budenz, dan John Lautner.