By sh!tcanning the entire lot.
[A school superintendent's] plan calls for teachers at a local high school to work 25 minutes longer per day, each lunch with students once in a while, and help with tutoring. The teachers' union has refused to accept these apparently onerous demands.
The teachers at the high school make $70,000-$78,000, as compared to a median income in the town of $22,000.[bold mine]
[. . .]
The school superintendent has responded to the union's stubbornness by firing every teacher and administrator at the school.
Goes to show what the teacher's union really cares about.
Via Glenn Reynolds.