At least naked chattel slavery, it did. The soft slavery of dependence, it didn’t.
Section 1.
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.
Section 2.
Congress shall have power to enforce this article by appropriate legislation.
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If you are convicted of a 'crime' where the punishment is 'involuntary servitude' or 'slavery', it is constitutional.
So, if the Congress makes the punishment for owning an 'unlawful' weapon or light bulb.........