This is great and all, but don't be stupid about it. Big cities don't have any natural resources. If governors have enough guts to try to stop people from working, they will have enough guts to send the military out to the natural resources. At the same time you are protesting the shutting down of your big-city businesses, get your militia out to the farms and other major resource areas. At least send scouts with ways to inform you when the military is approaching.