SUMMARY: Bernard L. Madoff, a former chairman of the Nasdaq Stock Market and a force in Wall Street trading for nearly 50 years, was arrested by federal agents Thursday, a day after his sons turned him in for running what they said their father called "a giant Ponzi scheme."

The Securities and Exchange Commission, in a civil complaint, said it was an ongoing $50 billion swindle, and asked a judge to seize the firm and its assets. "Our complaint alleges a stunning fraud that appears to be of epic proportions," said Andrew M. Calamari, associate director of enforcement in the SEC's New York office.

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RELATED DOCUMENTS BY DOUG CORNELIUS

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