The number of prisoners who are capable of this type of work are minuscule and unlikely to affect wages at large.
If you're interested in doing hard federal time, I would suggest you consider interstate trafficking of distribution quantities of drugs.
If you're white, maybe. There's still stories of some states having the book thrown at recreational drug usage.
There are always stories, but the majority are the above. If you have a state in mind we can look at the data together.
...there are two million people in prison. Several million more in various stages of the carceral cycle who be be easily subbed in when more labor is required.
Slavery of this variety is alive and well.