In Chicago (and I don’t know how true this is anymore) gangs were divided into two alliances: People and Folk. Think of it sort of as a National League and American League of Gangland.
People gangs were traditionally associated with the left side (rolled-up pant legs, earrings in the left ear, that sort of stuff.) In Chicago, these gangs would be the Latin Kings, El Rukn (I don’t think they’re still around) , and the various -Lords (Vice Lords, Spanish Lords, Gaylords.)
Folk gangs were associated with the right side. These would be all the Disciples spinoffs (Gangsta Disciples, Latin Disciples, etc.) and Two Six to name the predominant ones around my area.
I don’t know whether these distinctions are national or a Chicago thing, but this was the case in Chicago in the 80s and early 90s at least.