Exactly. Unions end up becoming chums with the university admins. The students come and go but the admins are around a long time. Eventually the university just turns the union into a lower tier of management that effectively keeps all of the students in line. The admins learn which "issues" are favored by the unions and which issues hold sway with union. Then when they want to fire someone, they just frame it as an issue about which the union doesn't care.