I mean with things like sex trafficking, labor trafficking, etc. IMO it should be called slavery, and those affected need to be rescued from slavery.
A pimp enslaves people
The Tate Brothers (allegedly) enslaved people.
IMO, referring to sex/labor trafficking to slavery will show it just how evil it actually is.
Against their will or not?
Both
Not both. There is a massive moral difference between these two cases.
Legal and moral only rarely overlap, and usually by accident.
To the contrary. Most of legal framework is built on top of moral one