We are going to need to pressure local politicians (state and city)

First invalidate all administrative warrants (governors and mayors can do that in their jurisdictions)

Second ban all administrative warrants as illegal under penalty of law (state house/senate and city councils can do that in their jurisdictions)

Third require all immigration court activities can be done remotely (thus eliminating court pick ups and ensuring safety for the due process rights to be defended) (judges themselves can do this but it can also be enforced by the local legislature bodies)

Fourth enforcement of existing firearms laws involving school zones. This will result in numerous arrests of ICE agents; taking them off the streets. (Individual police officers can do this but it also can be enforced by the local legislature bodies bodies)

Fifth enforcement of antiterrorism laws. ICE funny enough violates these with their current tactics. (That is why Swat shows up when you report masked people with guns in an area). The creative application can be used to arrest the bulk of current ICE agents and thus if used in combination with all of the above; just a pair of honest police officers enforcing the existing laws can quickly neutralize ICE in a city. (This one is the least likely but most powerful defanging method)