AA gang can be a group of friends who hang around together, live in the same area as each other, or all go to the same school.
Some gangs do become involved in crime and might try and get you involved with what they do.
There are some gangs who take part in criminal activity and who might try and get you involved with them and what they do.
They might carry knives or other weapons and use them to show off or threaten people.
Remember: If someone is trying to make you join a gang and you don't want to, tell someone about it.