Zhang Zhengyi, who claims to be a teacher, publishes an open letter accusing Chongqing No. 8 Middle School principal Zhou Yingchun of having police take him away in the middle of the night for investigation after he reported irregular admissions; the letter has already been deleted online.[Chongqing][Education Rights Protection][Social Media Account Bans][Chongqing No. 8 Middle School][Zhang Zhengyi]