Business disputes happen. You and a contractor may disagree on who is responsible for a project's failure. You may have to sue a client or distributor over a broken contract.
It generally isn't illegal for an employee or former employee to criticize a business, but defamation by a disgruntled employee is another story.
Contract negotiations and disputes can take up a great deal of energy and time when you run a business, but you ultimately hope that everyone will eventually come to an agreement that they can live with (if they can't find one they actually like).
How bad can it be if you don't get a permit for a building on your own property before you start construction?