FILE - In this Feb. 1, 2017 file photo, University of California, Berkeley police guard the building where Breitbart News editor Milo Yiannopoulos was to speak. UC Berkeley police took a hands-off approach to protesters on the campus last week when violent rioters overtook a largely peaceful protest against a controversial speaker. But that response is being questioned as demonstrators become increasingly hostile and politics are more polarized. (AP Photo/Ben Margot, File)
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