No problem if BOTH the teachers and children actually live by this.
First off, they're boycotting a LOT of union-made productss. Don't drive cars, ride buses or trains, board airplanes. Oh, and if they ride bicycles only buy those made at their corner Wright Brothers Bicycle shop.
Birkenstocks? Starbucks?
Electricity?
Heating oil?
...and make sure none of the Wright Brothers' suppliers are big businesses either. They better have a mini-steel mill in the backyard, mine their own iron ore and limestone. Better be growing some rubber trees for the tires, too. And manual control of those processes better be the order of the day -- no purchasing control systems from Siemens.