Odd that you should mention that; but it is a fact that human trafficking is a problem here in the US. These people who were smuggled in are very often de facto slaves. It can even be argued that illegal immigrants are de facto slaves right now: they may or may not be justly [or even legally] paid by their employers and are afraid/unable to seek justice within the legal system.
Just because you change the term doesn’t make it different. Just because someone says something is illegal [or legal] doesn’t make it so; as an example the City’s Magistrate Court has a big “No Weapons Allowed in Building” sign on its door... however, the State Constitution says:
“No law shall abridge the right of the citizen to keep and bear arms for security and defense, for lawful hunting and recreational use and for other lawful purposes, but nothing herein shall be held to permit the carrying of concealed weapons. No municipality or county shall regulate, in any way, an incident of the right to keep and bear arms.”
Big difference between state-sanctioned slavery and the under the radar trafficking. Although our border policy comes very near to state-sanctioned human exploitation.