Though I Am Gone (2006)
Though I Am Gone (Wo sui siqu (我虽死去)) is a Chinese documentary film by Hu Jie about Bian Zhongyun, a school's vice principal "who was beaten to death by students in August 1966 during the China's Cultural Revolution." The film includes commentary and photographs taken by the deceased woman's husband, 85-year-old Wang Qingyao. The film is banned in China, where the Communist Party reacted with sensitivity in part because "many of the former members of the Red Guard who attended Bian's middle school were members of the families of high-ranking officials who are still revered today."
More at Wikipedia.