In this Feb. 1, 2017, file photo, University of California, Berkeley police guard the building where Breitbart News editor Milo Yiannopoulos was to speak in Berkeley, Calif. UC Berkeley police took a hands-off approach to protesters on the campus when violent rioters overtook a largely peaceful protest against a controversial speaker. After a series of protests around the country, some institutions are rethinking their security and tactics in an age of growing political polarization. (AP Photo/Ben Margot, File)
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