You can't be serious
There have been gangs in this country since its inception
Go into chicago and ask around
Chicago has several record labels,and violent rap groups that fight each other.they're not considered gangs,though.they are moar focused on making music,and recording diss songs instead of fighting over turf or money,or other stuf gangs traditionaly used to do. today, they argue over social media,and in rap songs. look at this article from ABCnews from 2012 "Chicago's Gang Violence Feuled Through Social Media".
http://abcnews.go.com/US/chicagos-gang-violence-fueled-social-media/story?id=17464743here's a few key quotes:
"Gang members, some of
whom are aspiring rappers, often use Facebook, Twitter, Hipstar, MySpace, Youtube and other social media outlets to spread inflammatory messages and encourage rival gangs to respond."
"they are fighting for reputations and the opportunity for a big break. In short,
it's a "beef over rap," he said.
see,i'm knot making this stuf up

even the news reporters,and police agree,Chicago doesn't have gangs,they have rap wars.