TALLAHASSEE, Fla. (NSF) – The University of Florida is refusing to allow white nationalist leader Richard Spencer to speak on campus next month, citing “serious concerns” about safety in the aftermath of a deadly weekend clash in Charlottesville, Va.

Spencer is a leader in the “alt-right” movement, blamed for a deadly outburst following a “Unite the Right” rally Saturday in Charlottesville. One person died when a car plowed into a group of counter-protesters, and two Virginia state troopers also died in a helicopter crash while monitoring the situation.

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