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Riot police wearing protective masks attempt to disperse crowds during a protest in the Causeway Bay district of Hong Kong, China, on Friday, June 12, 2020. One of Chinas top agencies responsible for Hong Kong urged the citys education departments to cut off the black hands influencing its school system, in response to students plans for a weekend referendum vote to determine whether to strike against new national security legislation. Photographer: Justin Chin/Bloomberg via Getty Images

Riot police wearing protective masks attempt to disperse crowds during a protest in the Causeway Bay district of Hong Kong, China, on Friday, June 12, 2020. One of Chinas top agencies responsible for Hong Kong urged the citys education departments to cut off the black hands influencing its school system, in response to students plans for a weekend referendum vote to determine whether to strike against new national security legislation.  Photographer: Justin Chin/Bloomberg via Getty Images