What would you do if a community leader started enforcing a law before it was made public?

Some communities are businesses, and are run by the owners of the business. They have every right to do whatever they want with their business. They can summarily fire employees for any reason at all, if it’s an employment at will state.

Still, to start sanctioning someone for violations of rules they didn’t know about, and, in fact, no one knew about (because there weren’t published), seems a little unfair. It happens all the time, I’m sure. Credit card companies are always changing the rates and terms on customers (although they are required to send notification out).

What would you do in such a situation? What would you feel if you were in such a situation? Would you move out of town? Would you try to fight city hall? What?