This documentary is way on the conservative side of the political spectrum, but it makes some very valid points on free speech.

Brainwashing 101

"Today, many American college campuses are dominated by the ideology of political correctness. According to the tenets of political correctness, the United States is the source of all the world?s troubles, capitalism is evil, and people?s biological heritage makes them either "oppressors" or "victims". Political correctness does not tolerate dissent, so students who disagree with the ideology are often punished.

Tools like speech codes are used by school administrators to enforce thought conformity. At Cal Poly, one student endured a Kafkaesque disciplinary ordeal that lasted more than a year and ended up in federal court?just for posting a flyer announcing an upcoming event! Welcome to the world of higher education today, where universities seem more intent on teaching students what to think than how to think."