work camp
prison camp
prison farm

Some old pieces of song he'd learned on the prison farm or in the War afterward.

Just where prison farms fit in the current political landscape, though, is unclear.

The facility also runs a prison farm for low and open security inmates.

For services in connection with the development of prison farms.

I'm going to be a guard on one of the prison farms.

In all his rages, six months on the prison farm, he had never planned to kill her.

Eight months out of his life, weeding on the prison farm.

He thought his best opportunity to escape would be while working on the prison farm.

He doesn't care about the girl; all he wants to do is put her on that prison farm, out of his way.