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Yale students shouted down professor who allowed offensive Halloween costumes | Daily Mail Online
Yale University - Wikipedia
New video shows mob of Yale students encircling professor and angrily demanding an apology after he told them to 'just look away' if they were offended by racist Halloween costumes | Daily
What is the backstory to the 2015 Halloween race controversy at Yale? - Quora
Yale University - Wikiwand
New Video of Last Year's Yale Halloween Costume Confrontation Emerges | The Foundation for Individual Rights and Expression