In his new book “Speak Freely: Why Universities Must Defend Free Speech,” Keith Whittington, William Nelson Cromwell Professor of Politics at Princeton University, argues that universities must protect and encourage vigorous free speech in order to fulfill their most basic, fundamental, and essential purposes, including fostering freedom of thought, ideological diversity, and tolerance. Examining such hot-button issues as trigger warnings, safe spaces, hate speech, disruptive protests, speaker disinvitations, the use of social media by faculty, and academic politics, the book describes the dangers of empowering campus censors to limit speech and enforce orthodoxy.