Agricultural workers in the UK are stripped of their passports and their pay, and gouged on rent.

This is a world-wide pattern, much like what happens to construction workers in Qatar.

A government that doesn't want to let businesses exploit people could adopt laws that make it harder to get away with this. One approach would be to make the farms directly liable for how the temp agency treats the temporary workers. It would help to prosecute the executives and staff of the temp agency, as well as the agency, for any wrongdoing; I can't tell from the article whether this is already done.