This is SO pre-empted by the NLRA. It should also be illegal as a basic property rights matter, but that is another story. Local governments are crazy (and short-sighted) to give into these ordinances. Plus, have they seen a Wal-Mart parking lot lately? It’s not like a union hall parking lot – the Acorn activists and union organizers are about as likely to get hit by a car as they are to get someone to pay attention to them. I’ll say it again – this is the type of thing that drives people AWAY from unions (and companies AWAY from towns – not just Wal-Mart store either – nobody wants to do business in a town that wants to micromanage your property rights or the way you do business). Work on the DEMAND side of the equation – i.e. provide services that Wal-Mart workers demand – and you’ll be more likely to get somewhere. Actually, that is probably the best argument for allowing ordinances like these – it gives labor unions and community activists a chance to see supply and demand in action.