WATCH: Publishing the Pentagon Papers "altered the state of the First Amendment and the history of the world, by what? ... By printing the truth," Tom Hanks who stars in new movie, "The Post," tells Jeffrey Brown. | PBS NewsHour

After seeing the powerful film The Post, last night, we left the theater hungry for more backstory. In our PBS Books interview, author Steve Sheinkin talks about Daniel Ellsberg, the man who leaked the Pentagon Papers, and the subject of his YA book, Most Dangerous: Daniel Ellsberg and the Secret History of the Vietnam War. Both the movie & book introduce us to the real life cast of characters involved in the tense First Amendment showdown between the US Government, The Washington Post and The N