Federal prosecutors say 31-year-old Duhamel Cassagnol, of Milton, was also sentenced Tuesday to five years of probation and ordered to pay more than $13,000 to the victims.
He previously pleaded guilty to charges including sex trafficking by force.
Cassagnol was arrested along with 24-year-old Geneiva Whaley, of Connecticut, in December 2017. She was sentenced in October to a year in prison.
They kept the women addicted, promising heroin only if they generated income. Cassagnol also beat three of the victims and threatened violence against the fourth.
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