Any Milwaukee taxpayer can call the Superintendent at (414) 475-8393. The State Superintendant of Public Instruction can be reached at 1-800-441-4563.
The individual schools can be found at:
http://www.milwaukee.k12.wi.us/pages/MPS/Schools/Map/high
http://www.milwaukee.k12.wi.us/pages/MPS/Schools/Map/Middle
http://www.milwaukee.k12.wi.us/pages/MPS/Schools/Map/Elementary-k8
Outside of Milwaukee, call your state legislator and let them know you are outraged that children are being exploited by ideologues for partisan purposes. Don't bother calling the governor.
It might not hurt to contact the Wisconsin Labor and Industry Review Commission. After all, Wisconsin Citizen Action and the teachers' union are using unpaid underage labor in possibly hazardous conditions.