The administration of Georgia Southern University has blocked a student group from inviting sixties radical and education reformer William Ayers to campus.

Ayers, a leader of the Weather Underground, became notorious during last year’s presidential campaign because of his connections to Barack Obama. He was invited to GSU by that campus’s Multicultural Advisory Council, a student group.

Though Ayers had spoken at GSU before without incident, his invitation drew criticism and protest this time, and the university claimed the controversy would raise security costs for the speech to $13,000. They cited these costs in vetoing the event. 

The administration of the University of Nebraska at Lincoln rescinded a speaking invitation to Ayers last fall in the face of criticism by donors and political leaders. Ayers was forced to cancel a speech at the University of Toronto last month when he was denied entry into Canada by border officials.