At several points during the inaudible lecture, protesters turned off the lights and displayed a projection with the words “white supremacist” on the wall with an arrow, pointing down at Mr. Murray. Others held signs: “We punch white supremacists!” and “Nazis go away.” Over a dozen University of Michigan police officers stood by. No one was removed from the event.

Finally, after some 45 minutes of pandemonium, which included a graduate student protester taking to the stage and co-opting the lectern from Mr. Murray, the protesters marched out of the event en masse. Mr. Murray spent the remainder of his time lecturing on what he was invited to speak about: The 2016 election and how we got stuck with President Trump, whom Mr. Murray fiercely opposes.