What is the main conflict in The Day They Came to Arrest the Book by Nat Hentoff?

Of constant concern to every American is the First Amendment right of free speech. What should authors write, what should be published, what should be allowed in book stores, what should be studied in schools, and what should students be allowed to read— these are questions that are continually being argued by parents, teachers, students, ministers, The American Civil Liberties Union, and morality groups.