Wiktionary
n. work which one is compelled to perform due to lack of options, by choice while in prison, or outright against one's will, while in a condition confinement or slavery.
Usage examples of "prison labor".
It was nearly a mile out, a long swim even for a strong man, and his own strength was sapped from the hard prison labor and the long walk without food.
Reaching OrbLab 2, the team members moved through the airlock booths and the decontamination shower, one by one, then entered the prison labor complex, shivering in their damp new clothes.
Kutthroats, and they have me playing nursemaid in a prison labor camp.
Me, Master Sergeant Ferkel, the best damned flamethrower in Kirjassoff's Kutthroats, and they have me playing nursemaid in a prison labor camp.
We have since heard a rumor that this is prison labor and that is why a tourist can't see something as unsecret as a brick yard.
Because prison labor is state enterprise, it doesn't contribute to private profit.