[nradov]

Again, that's a civil issue not criminal. In theory some lenders might have been able to file civil lawsuits against some of their own employees to claw back part of their bonuses or whatever, but that would have been pointless.

[leereeves]

You're right, it's civil rather than criminal, but in the case of some investment companies, like those that sold mortgage-backed securities, it can be enforced by the SEC.

https://www.law.cornell.edu/uscode/text/15/80a-35

That's just one example. I expect that, had they wanted to, the government could have found many applicable laws to go after those responsible for the financial crisis.