A little over a year ago United Airlines fired two senior flight attendants who were union leaders. A junior crewmember reported their mask violations, and then the two senior crew solicited false conduct reports against the junior flight attendant in retaliation. United uncovered this, and had no choice but to fire the union reps.
It turns out United fired six senior flight attendants for bullying junior crew. And the six flight attendants are suing for age discrimination.