Serious question, When you observe a crime and the perpetrators are fleeing, when you radio for backup do you give as complete a description as possible or do you have other units stopping every white, black and oriental they see?
I addressed this earlier. For an unknown, detail is the key. These kids were not unknown to the OP. He knew who they were, and where they lived. He could have just as easily identified them by he building they lived in. INGO membership doesn't investigate crimes, there's no reason to qualify, unless he expects us to track down people he is already intimately aware of. And what's the point of that?
If they had been girls he could have used bevy, Or crows a murder, or bananas a bunch. Gang is simply a word to describe a group.
I utterly reject this premise. I'm not buying beachfront property in Arizona.... some times quotes mean something (unless, it's just yet another punctuation error).