He's not a state attorney general, but David Grais may soon become the lawyer that Wall Street hates most.

His New York firm, Grais & Ellsworth, is behind several of the most prominent investor lawsuits against securities dealers over MBS  issued during the boom years that have since soured. This week, Grais filed suit on behalf of the Federal Home Loan Bank of San Francisco (FHLB San Francisco), seeking to push $19.1 billion of failing securities back into the hands of the companies that issued or underwrote them. The defendants include Bank of America Corp., JPMorgan and several U.S. and foreign investment banks.

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