BEIJING—The ruling Communist Party’s deadly 1989 crackdown on the Tiananmen Square pro-democracy protests never ended for Fan Baolin, who served 17 years in prison and says he sneaked out of China last year to escape surveillance that included cameras trained on his apartment and pressure on his family to deter him from more activism. Fan, who took part in the demonstrations and later worked for the party’s vast security apparatus, was arrested in 1999 for giving activists abroad confidential documents about surveillance of Chinese pro-democracy exiles. Released in 2016, he became among those who still are watched by the party a generation later in an effort to erase public memory of the protests in the heart of Beijing. “Once you are on the Chinese government’s blacklist, you will be tracked for life,” Fan told The Associated Press ahead of Friday’s anniversary of the June 4, 1989, military attack on protesters. …