There are many federal options here, starting with cutting off all federal funds to Los Angeles (first).
Los Angeles Police Department Won’t Honor ICE’s Requests To Notify Them Of Illegal Status
The Los Angeles Police Department (LAPD) is refusing to comply with Immigrations and Custom Enforcement’s (ICE) requests to notify them of the illegal status of held immigrants. KFI AM 640 reports that in 2016, the LAPD didn’t honor any of ICE’s requests.