Pretty sure we need Mayor Bass and the City Council to direct the LAPD to defend the populace from illegal behavior by ICE agents as well as random kidnappers. Force them to produce a judicial warrant or whatever paperwork applies, to only take the persons named in said warrant, and to refrain from escalating conflict with bystanders in order to justify taking them as well.
If it's "necessary" to arrest anyone else, they should be taken into LAPD custody rather than disappeared by ICE, and have their day in court.
Also LAPD should arrest any ICE agents who behave in criminal fashion. They may escape punishment because being fascist is their job, but it will slow them down.