So you don't want local/state govts to enforce federal law... and yes, harboring illegal immigrants is 100% illegal
There are various cases going through the courts right now that have ruled in favor of sanctuary cities. The case you are citing is not sufficient proof.
Currently, anti-sanctuary city policy is blocked by the courts.
Justice Department asks SCOTUS to lift nationwide block on anti-sanctuary-city policy
agency that enforces immigration law
But you are pro immigration law enforcement. By who exactly?
I'd imagine the FBI, DEA, and other federal law enforcement agencies could handle the task.
But being simple, I suppose we could simply operate under a pre 1996 immigration policy - - Back when America was great.
Or Pre 9/11 and DHS. I generally oppose the implementation of a police state and that's what DHs.
Fun fact:
The ICE budget is higher than all federal law enforcement agencies combined.
We've spent over 200bn on it since it's creation and people don't seem to be satisfied with the results. It's a poorly run money pit and that money could be used elsewhere.
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