Source: Thomas Lactot
Edward C. Banfield left the University of Chicago in 1959 to take a position at Harvard. (Leo Strauss, by the way, delivered remarks at Banfield’s farewell gathering.
When he returned to the University of Chicago in 1974 to give a speech on his text, The Unheavenly City, leftist radicals wrecked the event. As the above news story relates: “When Banfield was introduced inside the hall, about 10 members of the audience rushed the podium, knocking it over, and began calling Banfield a racist.” The protestors chanted for a hour, and Banfield left without ever getting the chance to speak.
Edward C. Banfield, An Online Resource 