The Doomsday Book was recently released by the Fed in response to a Freedom of Information Act filed by finance professor Emre Kuvvet. Bizarrely, the Federal Reserve initially denied Kuvvet's FOIA request, but its New York branch later provided the document with only names redacted.

The Doomsday Book reportedly shows that the Federal Reserve claims powers that far exceed what's explicitly authorized by Congress.

"Instead of adhering strictly to clear legislative boundaries to justify its actions during financial crises, the central bank appears to ground many of its decisions in the New York Fed's belief in the Fed's discretionary authority," Kuvvet wrote last December in the Wall Street Journal. "It relies on precedent for many of its actions, without explicit congressional authorization in some instances."

Indeed, on page 33 of the book, an anonymous author in the book wrote that "the powers of a Federal Reserve Bank are far greater than is commonly supposed."

For instance, the Doomsday Book documents how the Fed claims to have the power to bail out cities, or even to take ownership of companies, Kuvvet wrote.

The book shows that some at the Federal Reserve take a more conservative viewpoint about the central bank's powers, but over time it has gradually taken a more activist viewpoint.

Kuvvet wrote that he hopes the Doomsday Book might spur Congress to consider constraining the Fed. But given that the central bank has already claimed so much power, doing so might prove difficult, he said.

"Establishing clear legislative boundaries for the Fed might be a futile endeavor because the central bank—or at least the legal team at its dominant member bank—apparently believes it can rely on precedent to justify virtually any emergency action," he said.

While the Doomsday Book has been the subject of intrigue, critics of the Federal Reserve said it simply confirms what they already knew.