Residents of Mitchells Plain say they are fed up with the drug trade, gang rivalry and complicit cops.
Cape Town in the Western Cape has become a major crime hub.
People Against Gangsterism and Drugs (Pagad) said they will take the law into their own hands if the police fail to intervene.
The meeting was attended by about 200 residents. It took place at the Freedom Park Community Hall on Sunday to discuss ways to eradicate crime in their neighbourhood.
The meeting followed the death of teenager Annestley Hartnick, 16, who was shot multiple times in front of his family’s home on Saturday night.
He was one of two people shot dead at the weekend.
Pagad co-ordinator Mogamat Keraan said the community was tired of being held hostage by gangsterism.
“We will inform the police of the known drug houses and tell them if they don’t do anything we will shut them down ourselves,” said another Pagad member.
The community will meet again on Thursday.