The book Witness: A True Story of Soviet Spies in America and the Trial That Captivated the Nation is one of the biggest U.S. bestsellers of the 20th century, yet it is almost unknown among Americans today. Here to tell the story is Greg Forster on behalf of the Acton Institute. Forster is a Whittaker Chambers expert who has earned a Ph.D. with distinction in political philosophy from Yale University.