On a summer day in 2016, a posse of men surrounded Lu Yuyu on a street in Chinas southwestern city of Dali. He said they wrestled him into a black sedan and slid a shroud over his head. His girlfriend was pushed into a second car, screaming his name.
Mr. Lu had for years posted a running online tally of protests and demonstrations in China that was closely read by activists and academics around the world, as well as by government censors. That made him a target.
While…
After one man was snatched off the street for tracking protests online, he spent four years in custody and remains under close police watch
