WASHINGTON - Wall Street's biggest banks acted like used-car salesmen knowingly selling lemons to consumers, the head of a commission investigating the financial crisis said Wednesday, as top bank executives came under fire on Capitol Hill.

Former California State Treasurer Phil Angelides kicked off the first of two days of hearings with an aggressive exchange with Goldman Sachs Group Inc. Chairman and Chief Executive Lloyd Blankfein, suggesting the investment bank was not taking responsibility for its actions in the lead-up to the crisis.

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