Last Fall, I noted that while we basically only hear about "threats to free speech" on campus when the alleged perpetrators are liberal, attempts to shut down distasteful speech are quite bipartisan in flavor. In the Chronicle of Higher Education, Aaron Hanlon collects some right wing instances of speech suppression on campus -- including the striking statistic (drawn from FIRE) that, while campus liberals are more likely to try to disrupt or shutdown speakers, conservatives are more likely to succeed in doing so. This doesn't really surprise me -- on the one hand, there are more liberals than conservatives on campus, and on the other hand, if there's one thing conservatives are really good at, it's working the refs.
Again, the moral of this story isn't to simply flip things on their heads -- conservatives are the only threat to free speech, and liberals are as pure as driven snow. The right lesson is, to reiterate, that threats to free speech come from all sides of the political spectrum, and that genuine commitment to the principles of free expression -- as opposed to opportunistically crying "free speech!" only to swiftly abandon it once it ceases to be politically convenient -- is actually a rare beast.