I agree; it seems that the school board prevailed in this. If they didn't, the PSEA local would NOT have sent a letter such as this.
Texas is a right to work State, so not all teachers are unionized, however, Pennsylvania is all union and they are paid well - our district averaged in the upper 80's for salaries - I wouldn't think a teacher would be willing to take a chance on that kind of salary, but apparently they feel more powerful than they are