I am very surprised in all of this dialog that no one has brought up Hells Angels or The KKK?
Throw in The Aryan Nation for just seasoning!
While "Gangs" and "Groups/Clubs" may seem similar in structure, maybe the Biggest difference is the purpose that they were started?
Protect a Turf problem, have a structure, as opposed to a Greek Letter Organization with different Ideal and Morals who also have a structure.
Is there a difference between the two with the hazing? Yes.
Do Greek Organizations Haze and do some very stupid things that people get hurt or killed, yes. Was that The intent, I dont think so! Stupid and damn dumb, Yes!
Is it possible that any Group/Organiztion could have someone with a background who had problems but had the will to change their life styles. Yes, and I find nothing wrong with that! Good for them!
Maybe Gangs run rampant in a structured society, while clubs run a structured society and screw up.