Now I haven't looked into it in any great detail, but I don't see any immediate reason why a court would find such language to be unlawful. 

Seems like punishment to me.  

Not to arrest anyone , but to talk to the adults and possibly scare the kids with punishment options.

Corporations will likely begin developing their own schools to serve their own needs (this happened with a Bank in Brazil that couldn't location enough qualified prospects).(2)  Patent System overhaul....Due to speed of innovation, our patent system now discourages, not encourages innovation.(3) Remove all money from politics (unfortunately, I don't think this will happen).(4) All countries must develop a global governmental body and give it sufficient power to effectively police and punish corporations that commit crimes globally, particularly in countries with little power. 

Intentional violation of this requirement could be punishable by a fine"

What you can do is, ask the workers who they work for, then check if that person is licensed, if the workers and their company is not, then that will be grounds for termination due to unlawful illegal activity.

The Unlawful Detainer(UD) is to  regain possession and get the unit re-rented.  

@Sarah Pratt,In that case, I would re-instate the charges and, if found guilty, ask at sentencing that all penalties be trebled as punishment for the retaliation.... or, knuckle under and allow yourself and everyone after you to be bullied with impunity.The choice is yours.

The seller knows what he did- now it's time to punish him for it!

Im assuming you have the rest of the court unlawful detainer paperwork filled out completely or are going in to the court house to pick that up to be completed.