Answer :
Those who have been duly convicted may be forced to work without pay as punishment for a crime.
Answer:
Those who are punished for committing a crime.
Explanation:
The thirteenth amendment abolished slavery and involuntary servitude except for penal labor.
This exception allows to those prisoners who had already been convicted of crimes to be required to perform labor or another punishment while in custody. But to do that they must be convicted, not be waiting for the trial.
I hope this answer helps you.