I would like to know what gang members do for a living. Are they all selling drugs? Is it possible for them to do normal work (maybe outside their hood) and in their free time be a gangster? I would say if they have obvious gang tattoos I would recommend a long sleeved shirt at an interview :-
What a about selling guns, prostitution or extortion. Is that where a gang also operates? Might be a bit irritating attracting ATF by that.