For my story I want an undercover cop, to join a gang, so he can infiltrate it. However, in doing research I cannot find anyways to join a gang. So far I can only find cases, where youths join, but scenarios in which youths are drafted into gangs (through school related examples), are very different compared to how an adult would be. So I am wondering if their are any books or sites that talk about it at all? Thank you for your input. I really appreciate it.