四五运动
In early 2006, Mao Hengfeng was detained in a roundup of petitioners before the anniversary of the Tiananmen Incident and placed under residential surveillance. She was then charged with "violating the terms of residential surveillance," and placed her under "soft detention" in a small guesthouse room with six other men and women in Yangpu District, Shanghai. While under detention, Mao broke two table lamps in the guesthouse and was for that reason formally arrested on 30 June 2006 for "intentional destruction of property." She was sentenced to two-and-a-half years in prison on 12 January 2007 and imprisoned at Shanghai Women's Prison.