World Vision is welcoming the new bill around fighting modern slavery. 

The new bill, co-sponsored by National and Labour, will require large businesses to make reports on modern slavery in their supply chains public. 

Head of Advocacy and Justice Rebekah Armstrong says it will change how companies do business. 

She says there are other pleasing aspects to the bill too. 

Armstrong says that includes penalties to give the legislation teeth and the promise to create an anti-slavery commission.