Main article: https://en.wikipedia.org/wiki/Gangs_in_the_Los_Angeles_Count...

Definitely, but they represent the opposite problem. The thing about the LASD and LAPD is that they are... extrajudicial. It's not "They catch a gang member and do nothing", but rather "They arrest a gang member with no valid reason to do so, and tortured/killed them over some street shit." Sometimes it's not a gang member at all. The end of the CRASH unit started when an officer thought he'd flash gang signs and try to kill a plainclothes officer, all in a fit of road rage. Who knows how many times that happened to a random civilian and it got blamed on gangbangers (who happened to not be police)

The problem GP is describing is mostly with the courts, not the cops.