The Financial Panic of 1907 is often cited as a justification for the passage of the Federal Reserve Act of 1913 (signed into law on December 23rd . . . watch carefully what your legislators do to you during the holidays when nobody is paying attention, they continue to use this trick even today).
The Money Changers is Upton Sinclair's barely fictionalized account of the affair, and in the novel a character based on J.P. Morgan is lauded for rescuing everyone from a crisis that he created.
Since this is an historical novel, I encourage you to read the Wikipedia entry on The Financial Panic of 1907, keeping the financial crisis of 2008 and other recent Wall Street scandals in mind while doing so before you start reading this novel.