As It Happens 6:29 Arrest of Columbia student protester sends chill across campus, says prof The arrest and threatened deportation of a student activist at Columbia University is a threat to free speech on campus and across the U.S., says professor Michael Thaddeus. "It's a very dark day in the history of the Republic, when someone can be imprisoned just for exercising their constitutional rights," the Columbia math professor told As It Happens host Nil Koksal. "And it seems to be a nakedly clear case of that." Thaddeus is one of several faculty members at the New York school speaking...