[ericfrenkiel]

The label you are looking for is “duly convicted party,” per the 13th Amendment:

“Neither slavery nor involuntary servitude, except as a punishment for crime whereof the party shall have been duly convicted, shall exist within the United States, or any place subject to their jurisdiction.”

[hotpotamus]

If you can criminalize their existence, then I suppose it's off to the gulag with them.