What percentage of sandwich makers would understand that if they went to work somewhere in violation and were served a summons? The threat of that is probably enough to make the workers abide by the illegal contract. That's the part that makes me sick. Asshole owners of companies write these things as broadly as they can and basically challenge an ex-employee to hire counsel to have the thing thrown out, gambling that most (if not all) will fear a court battle and the money for representation enough to abide by them.