The number of people forced into modern forms of slavery has risen by a fifth in recent years to around 50 million on any given day.
It comes as the Government introduces new laws to prevent slavery and exploitation.
The minister in charge admits New Zealand needs to follow other countries already doing it.
One figure says legislation is a "long time coming".
It comes as the Government is called upon to introduce modern slavery legislation.
He brought 13 Samoan workers to Hastings between 1994 and April 2019.
