...which workers are actually essential. A thought I had that might help is to mini-shutdown every Wednesday. Also, for those essential functions have people work 4 10-hour days in rotation with their coworkers. Cut the number density of those onsite by 20% even for the essential folks.
Without question lots can be done. For the violators that keep their widget factories and gyms open, there is a bounty for employees or customers to rat out the business and fines for the operators. The authority for dealing with emergencies (like a pandemic) usually rests with governors of the states. Violators who don't comply can certainly have their day in court whether it's for their argument that they shouldn't be closed or for the adjudication of their criminal charges but those who disregard those orders should have them enforced by the state police or national guard.
Have nice night. 
Edit history
= new reply since forum marked as read
