Action is being taken by police in Barnsley town centre after locals and traders complained about people fighting and taking legal highs.
Police have put a dispersal order in place for six months around Barnsley College, the interchange and the Civic Theatre.
Chief Superintendent Andy Brooke, of South Yorkshire Police said: “There have been complaints young children have witnessed antisocial behaviour and fighting, which has left them extremely upset.
“People have felt intimidated and businesses are being affected.
“This is unacceptable and so in response to public demand we have obtained a section 30 order to make the town centre a safer place to visit.”
The order means anyone in a group causing others to feel intimidated, harassed, alarmed or distressed will be asked to leave the area.
Youngsters who are not with an adult will be taken home or to a safe place between 9pm and 6am.
Anyone who doesn’t follow the instructions issued by police could be arrested.