Minnesota Attorney General Lori Swanson sued collection agency Bradstreet and Associates on Wednesday for charging steep interest rates on overdrawn checking accounts at two big banks.

The Minneapolis-based company allegedly broke state law by charging as much as 22 percent in bogus interest on old bank overdrafts and fees. The lawsuit involves $18 million in debt and unknown interest costs that the firm was pursuing from people who overdrew Wells Fargo and U.S. Bank accounts.

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