From the Chinese press

Chengguan reveal brutal side

A man was reportedly beaten up by urban management officers (chengguan) recently for selling lamps in the streets of Beijing to help his 9-year-old daughter with her school project and acquire a better understanding of society. No matter what the result of the investigation ordered into the incident by Beijing authorities is, the incident has stained the image of the capital city for not being able to support a man helping his daughter get good education and a better understanding of life, says an article in Beijing News. Excerpts:

Urban management or law enforcement officers (or chengguan) are supposed to maintain order in a city and help it keep clean. So their only job is to ensure that vendors do not obstruct the flow of traffic, disturb pedestrians or litter the streets, not to beat up people selling goods in the streets.