America's college campuses, once thought to be bastions of free speech, have become increasingly intolerant toward the practice. Visiting speakers whose views do not conform to the prevailing left-leaning political mind-set on most campuses are at particular risk of having their free speech rights infringed upon. While academia has its own crimes to atone for, it's the students who have become the bullies as of late. A disturbing number seem to feel that theirs is an inviolate world to which no one of differing opinion need apply. As a result, everything from pie throwing to disrupting speeches to attacks on...