The case of Teresa Lopez, who claims she was ripped off in a 1996 mortgage refinancing deal, spotlights a growing controversy over mortgage brokers' roles.

A lawsuit filed by Ms. Lopez names not only Delta Funding Corp., of Woodbury, N.Y., which provided the loan, but also All State Consultants Inc. of Plainview, N.Y., a broker she claims sold her a bill of goods when it got her to refinance.

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