COPENHAGEN, Denmark—A Danish artist who is seeking to retrieve his sculpture in Hong Kong commemorating the victims of China’s 1989 Tiananmen Square massacre said Friday he wants safe passage guaranteed for himself and his employees when they dismantle and remove the artwork called “Pillar of Shame.” In an open letter, Jens Galschioet said that his presence in Hong Kong is “necessary” because the 8-meter-tall (26.25 feet), two-ton sculpture is “very difficult to move … without causing significant and irreparable damage.” The copper sculpture depicting dozens of torn and twisted bodies has been on display at the University of Hong Kong and has been in the city for 24 years. In 1989, the Chinese Communist Party (CCP) sent in the military to end pro-democracy protests in Beijing’s Tiananmen Square, killing hundreds, and possibly thousands, of people. The CCP has squashed any public discussion or memorializing of the events in mainland China. …