Just like everybody did with federal firearm laws, and federal farming laws...
These folks ain't Federal. They live in that town. They go to the grocery store, the dry cleaners, the movie theater, the car repair place. Show them no mercy. Shun them. Refuse their money, deny them service at your place of business.
Shun their kids. Shun their families.
To swipe a phrase from the liberals "think globally, act locally."