The workers have often had to pay huge fees to brokers to score the job in the first place, often including taking out large loans that must be paid back with the job's income.

On arrival, the worker realizes that everything they have been told is a lie. Their passport is confiscated and they are told that, if they try to run away to their embassy etc, goons will go to their family to extort the money owed for the loans by any means necessary, including torture and death.

Would you still call this a "voluntary arrangement"?