This is happening across white collar Industry; mainly 'voluntary' unpaid extra hours to stay in the game.
Unions / Management are required to balance the other, else their demands get out of control. White collar workers used to negotiate their own Contracts, now it is take it or leave it. Expect the Civil Service unions to flex their wings soon.
NASA selected a monkey & a man for the first spaceflight. After launch they both opened their sealed orders -
Monkey - control craft during flight, manouvere, operate radio & follow ground commands, land $500M craft safely.
Man - during flight - feed the monkey!