Comment by solaire_oa

You're being downvoted, I think unfairly, because this is a completely valid rebuttal.

Without going into a diatribe about how governments necessitate coercion and violence, enforcing such a "law" would indeed be counterproductive and hard to enforce, like you're indicating.

That said, mutual agreement by businesses and citizenry to make efforts to identify federal agents, then refuse to conduct business seems like it should already be entering discussions (if it isn't). Additional coercion by the local government doesn't need to enter the equation of civil disobedience.