Ali pleaded guilty to forced labor-related charges involving a woman from Indonesia.
Prosecutors say Ali had the Indonesian woman do her domestic work for practically no money at all, plus withheld the worker's passport.
The worker, whose name was not released, fled the Ali household last August.
She had been employed by Ali, first in Malaysia, since August 2002 and was in the U.S. on a temporary visitor's visa.
Ali has been in federal custody without bond.