When her husband fled China in 2019 to escape a police crackdown on dissidents, Lu Lina thought she and their young son could soon join him in safety abroad. In the end, the couple had to resort to filing for divorce in China to get around the exit ban. Lu’s husband, Liu Sifang, a musician and former teacher, was among a number of Chinese activists and rights lawyers who were either arrested, forced into hiding or self-exiled after attending an informal get-together in 2019 to discuss human rights.