When National Public Radio is addressing the problem, it’s pretty clear that it’s real.

Debate: Do Liberals Stifle Intellectual Diversity On The College Campus?

There is agreement on both the political left and right that a majority of college professors in the United States are liberal or left-of-center. But do liberals stifle free speech — particularly that of political and social conservatives — on college campuses?

Social conservatives often argue that campuses, as a whole, are generally hostile to views that don’t conform to the social and political left. Conservatives and evangelicals are rarely asked to speak at colleges and universities, they argue. And they point to numerous incidents where, when schools have asked conservatives to speak, those invitations have been revoked after clamor from left-leaning students and faculty.

But there are many who disagree with the premise that liberals quash intellectual diversity on college campuses. They argue that criticism is not censorship, but that conservatives too often label it as such. And when speech has been curtailed at colleges, they say, it’s far more often by administrators seeking to quell or ward off campus disruption than by left-leaning students and faculty.