What kind of government job specifically?

Most of them. Certainly the ones that have unionized. If you know someone in the inside, they probably know if there's a union.

You'll see more unions in government work because while private organizations breaking up unions is ethically questionable; governments breaking up unions is just openly totalitarian.

If I can't negotiate with a private employer, I might be a wage slave, but I can ask the government for help.

If I can't negotiate with my government job, it's not actually a job, I'm just a slave.