Wall Street bankers could have averted the global financial crisis, so why didn't they? In this exclusive extract from his book Inside Job: The Financiers Who Pulled Off the Heist of the Century, Charles Ferguson argues that they should be prosecuted: The Securities and Exchanges Commission has been deservedly criticised for not following up on years of complaints about [Bernard L.] Madoff. But not a single bank that had suspicions about Madoff made such a call. Instead, they assumed he was probably a crook, but either just left him alone or were happy to make money from him. It is no exaggeration to say that since the 1980s, much of the global financial sector has become criminalised, creating an industry culture that tolerates or even encourages systematic fraud. The behaviour that caused the mortgage bubble and financial crisis of 2008 was a natural outcome and continuation of this pattern, rather than some kind of economic accident. This behaviour is criminal. We are talking about deliberate concealment of financial transactions that aided terrorism, nuclear weapons proliferation and large-scale tax evasion; assisting in major financial frauds and in concealment of criminal assets; and committing frauds that substantially worsened the worst financial bubbles and crises since the Depression. And yet none of this conduct has been punished in any significant way.