Comparing mafia and creditors is non-sense: mafia get their power from their choice to use unjustified violence, while creditors get their power from your choice to borrow in the first place.
Disagree with him if you want, but his entire point is that the lines between "their choice" and "your choice" are often blurred.
Creditors get their power by virtue of the monopoly they have on the creation of money. This is a right restricted to an extremely small subset of people, which are basically the government and large banking institutions. This right is backed by violence. I think the comparison between Mafia and banking cartels has merit.
Creditors also get their power from the ability to jail those who do not pay debts (threat of force). These debts are often unknown to the debtors. This is becoming an increasingly large problem in the United States.