This subject is very popular in some areas of political discussion.
In fact for many the idea of auditing the FED is something that should be done for many good reasons, however it could also create a real threat to the dollar as a viable currency.
For example if it were determined that the FED were dishonest and corrupt, (allegedly) there would be serious problems that could create economic ruin for many of the wealthiest.
So, for those reasons even though the house of representatives have actually passed a bill to audit the FED Harry Reid will never allow this to be voted on in the Sinit, (Senate)