Gangs of youths on the Peckham estate where Damilola died made lives miserable for the people who lived there.
Some gangs can be violent with many members
carrying weapons such as knives.
Some members of a gang on the Peckham estate had convictions for theft, assault and drugs.
It is often difficult to bring these gang members to court as they are so young.
And many people are too frightened to give evidence against them.