more than slave

In some of the countries, there's a cruel secret that the government had been hiding between themselves and their subsidy mental hospitals.
They gather mental patients who have no support or stable family in their separate self-payed mental hospitals with a promise of "Paying for their health care and making sure they are treated" but after some time, if it was fail they would sell the patients as slaves or anything else to rich people just for the money

Error was a schizophrenic patient. He thought that everything he saw was just an illusion or imagination

And guess what happens?