From the New York Times (link):
Several galleries in this city’s thriving arts district were recently ordered by government officials to remove more than 20 paintings, apparently because they dealt with political themes, artists and gallery directors here said.
The works, some of which featured radical portrayals of Mao and references to the Tiananmen Square uprising in 1989, were taken down just before one of the city’s biggest art festivals, which opened on April 30.
“A group of men came and ordered the workers to take it down,” said Huang Rui, an artist and arts organizer here who had one of his works removed. “We had to do it. The workers in the gallery were scared.”