What laws deregulating the financial industry caused the meltdown?

I've heard it said that our current mess was caused by deregulation of the financial industry. But I can't seem to find the actual laws or acts that count as "deregulation". The only one that is even remotely applicable is the clarification that credit default swaps were not regulated by the CFTC. But that was simply a clarification rather than anything new. So can anyone tell me SPECIFICALLY which laws and acts of deregulation caused these problems? And how?