It seems she felt they were being used as unpaid labour.

In other words, paid and unpaid labor for the worker.

And in truth, after 22 years of unpaid labor, Lederman was probably ready to move on.

Their unpaid labor was the fuel that made the system run and allowed it to operate tuition free.

The parents are quick to seize on anything that might suggest we use boys as unpaid labour.

Oh, hard return for all her unpaid labours of love!

The issue, they said, is to publicize the situation and to change the way the on-line service uses unpaid labor.

The men performed $6 million of unpaid labor in return.

The use of forced, unpaid labor went on the books as a criminal offense.

Such children were generally used as sources of unpaid labor.