As the spotlight continues to shine on John Corzine’s failed financial firm MF Global, investigators are looking into the more than $600 million in client money that is still missing several days after the company’s collapse. MF Global’s troubles grew over the summer, as Greece and other European countries faltered and regulators became worried about the security of the bonds the company had purchased, fearing that if the bonds fell in value, lenders would demand more collateral. And now, scrutiny is on the regulators, too: the top federal regulator investigating the case is a former colleague of Corzine’s, which critics say may challenge the objectivity of the case.

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