slave trade; human trafficking
Refers to the act or business of buying and selling people. Can be used historically for slave trade or in modern contexts for human trafficking.
Human trafficking is an international problem.
slave trader
A person who engages in the slave trade or human trafficking. Less common than the trade sense.
He was arrested as a slave trader.
Compound of 人 (ひと, 'person') and 売り (うり, 'selling'), the continuative form of 売る (うる, 'to sell').