File-University students clean the "Pillar of Shame" statue, a memorial for those killed in the 1989 Tiananmen crackdown, at the University of Hong Kong Tuesday, June 4, 2019. A monument at a Hong Kong university that commemorated the 1989 Tiananmen massacre was boarded up by workers late Wednesday, Dec. 22, 2021, prompting fears over the future of the monument as the city's authorities crack down on dissent. (AP Photo/Kin Cheung, File)
