Loan sharks
Loan sharks are an informal way of describing a person that sells loans but with very high interest rates. This means that they pay you for now, and you pay them later. But you pay them much more than you got paid by them. Loan sharks tend to ask for something beforehand anyway, like someone's passport for reference. Loan sharks are mostly illegal. They tend to use blackmail and other nasty ways to get their money back - if you refuse to pay them back.