FORTUNE -- Much of the talk about bad behavior on Wall Street since the financial crisis has been about mortgages with a little bit of insider trading sprinkled in. And that makes sense. Everyone immediately understands what a mortgage is. And the housing bust that resulted from all those bad home loans affected us all. And Hollywood has taught us to ooh and ah over insider trading.

But there is another scandal that has come out of the financial crisis that at least to me makes the mortgage underwriting scandal look like small peanuts, and it has been heating up lately. Two weeks ago, the government disclosed that it is looking into bringing criminal cases against traders and banks that manipulated a key bank lending rate, called LIBOR.