will choose influence and social categorization theory. That means when someone has negative experiences and they want you to do the same, that puts you in a difficult situation with them. Which makes them commit crimes. This is what happens when we hang around with some bad people at a younger age and they make your life dangerous which separates gang boys from the family and their community.
At the beginning I want to mention the family because family is one of the most important things for a young kid. Family should tell them the good side and treat them as proper good people. For example Tommy also had pressure from his family to be like his father even though he wanted to play football and go against their expectations, which I believe all added up to Tommy, thinking it would be a good idea to join the gang team. This line proves that if his family treated him goodly then he would never think about joining a gang.Tommy said that he had issues with authority due to his father beating him. He also said that he wanted to fit in with the other guys in the gang who had nice things and shiny cars and, in order to do so, had to commit crimes to prove his faithfulness to the group. He also got bullied at a taco stand when he was 13 and wanted to toughen up by joining a gang.
I am really not familiar with social categorization theory. Who proposed it?