Charlotte Allen, writing on Minding the Campus, describes the tactics used by the University of North Carolina to prevent the militants in the Students for Democratic Society from disrupting a second talk by a speaker they felt should be hounded off campus.

This was not rocket science. I think that the lesson here is that if college administrators really want to ensure that a speaker will be allowed to give his talk without disruption, they can. It follows that when they don’t take the necessary steps, it’s because they don’t particularly mind if a speaker is shouted down.