You could get the LAPD taken over by the Feds after a thorough house-cleaning decapitating command staff under a "consent" decree that made Reconstuction look warm and fuzzy until the DOJ decides LAPD or whatever successor organization takes over is run by competent adults.
Street policing would be butt-sexed for a decade until the command staff got a handle on acceptable training/ROE protocols. LAPD wouldn't be able to tie their shoes w/o the Feds signing off in triplicate then giving the whole thing a miss when the costs of oversight get too burdensome.
LSS, if you think the Ramparts scandal is bad, just wait until the Feds step in. Things could definitely be worse.
I'm NOT a huge fan of LAPD and how they policed minority neighborhoods like an occupying army.
However, NOBODY was ready for how the crack epidemic was going to fuel fratricidal bloodbaths. Not the feds, not the LAPD, not anyone knew what to do to what extent.
Most importantly, the nature of gangs changed from folks that lived in neighborhoods since day one and had a myriad reasons to keep beefs just to active players and allowed older members become emeritus and live straight lives to ihilistic folks like MS-13.
MS-13's leaders grew up in El Salvador's civil war with beheadings, massacres, and so forth. They had no expectations of living past their twenties or allowing members to go straight. You bang until you're dead or in jail.
Gangs of every stripe adapted to the new levels of violence until sanity reasserted itself when most of the folks calling for that level of violence were dead or LWOP'd and folks got back to business rather than privng whatever point.
LAPD's response was more firepower, and letting folks off the leash to intimidate folks into compliance. We saw how that worked with the Rodney King riots and a myriad other ghastly messes.
What really screwed with policing efforts was the fact that the level of violence they could inflict was nowhere near what the gangs would do to people that crossed them.
Anyone who told on gang members died or horribly maimed.
If you're choices are a BS OOJ beef and a few months in County vs dying or getting permanently maimed, they'll clam up and take the jail time.