From Reuters (link):
Dozens of Shanghai residents protested on Wednesday over their forced relocation to a remote corner of China in the 1960s, defying the official silence on the 40th anniversary of the chaotic Cultural Revolution.
The 150 or so protesters, many carrying signs reading “there’s nothing wrong with petitioning,” gathered outside the Shanghai Civil Affairs Bureau, which includes a petitions office where citizens can bring complaints to the government.
Most were sent to Xinjiang, China’s most northwesterly province, as part of a Maoist “learn from the masses” campaign where they were forced into hard physical labor.
See also How “silent” were Chinese media on the fortieth anniversary of the Cultural Revolution? by David Bandurski and Brian Chan