Why do you suppose they would not want an audit?

U.S. Senate blocked a bill last week to audit the Federal Reserve.
Rep. Ron Paul and more than half of his colleagues in the House co-sponsored the Federal Reserve Transparency Act, HR 1207, which they hope to have hearings on soon. On the Senate side, Sens. Jim DeMint, Mike Crapo and David Vitter co-sponsored S 604, companion legislation introduced by Bernie Sanders. But it was stopped cold before even being introduced on the floor on "procedural grounds."
America is in the worst economic situation since the Great Depression; the value of the dollar is tanking on the world market; and the Federal Reserve wields the greatest power to control it, with virtually no accountability -- let alone that the American people and even Congress have virtually no knowledge of what those inside are doing day to day.
There are two primary problems with the Federal Reserve. First, its very existence is a sheer contradiction of the 10th Amendment to the Constitution. As Ron Paul explained last week: "Our Founding Fathers never intended for a single entity such as the Federal Reserve to have this much power. In fact, there is no authority in the Constitution for the federal government to create a central bank, to enact legal tender laws, or to print paper money. The Tenth Amendment is quite clear that 'The powers not delegated to the United States by the Constitution, nor prohibited by it to the States, are reserved to the States respectively, or to the people."
Secondly, the Federal Reserve is flat-out bad for the economy in the long run because it creates false fronts or temporary escalations in the free market, which eventually cycle around and lead to downturns or more need for other Fed fixes.
The fact is the Federal Reserve is one of the best examples of government control run amok and its oppression over its people. It rules by dangling carrots, cheap rates and loans before the American public, which in turn oppresses people by their inability to resist further debt. The Fed is the dealer in greed and debt, and its drugs are easy money and credit. Under the Federal Reserve System, Americans and our economy have to return to the Federal Reserve for repeated fixes like a drug addict. Otherwise everything goes into the tank.
If we can get the flow of the Federal Reserve under control, others drawing from its wells will become more manageable and accountable. Its open market operations and dealings with central banks and foreign powers at the very least must have oversight.
Nancy Pelosi and Harry Reid are going to fight to prevent the passing of any legislation that regulates the Federal Reserve, because they are in cahoots with the White House and also don't want the trade secrets of the Federal Reserve revealed nor its power restricted. It is being used right now by the Obama administration and the Democratic majority in Congress for political expedience and special interests.
Henry Ford was probably right when he said, "It is well enough that people of the nation do not understand our banking and monetary system, for if they did, I believe there would be a revolution before tomorrow morning."