Historian Tom Woods here discusses his recent kerfuffle with Indiana University. A student group asked him to speak about his book on the causes of our recent economic crisis. Initially, the university said no, on the advice of professors who opined that Woods did not have proper academic credentials to discuss the subject. Fortunately, the students did not back down, and the talk (recounted in the piece) happened.
What is especially infuriating about this is the academic mindset that only people who have the right sort of degree should be permitted to talk about a subject; others must be kept away from the students.