A consumer advocacy group has sued Chevy Chase Bank, claiming the McLean, Va., thrift cheated credit card customers out of millions of dollars.

Washington-based Trial Lawyers for Public Justice filed suit against $6.7 billion-asset Chevy Chase last month in Circuit Court for Baltimore. The group, which is seeking class-action status for its suit, accuses Chevy Chase of breaching its contract with "hundreds of thousands of cardholders" by raising interest rates above a promised cap.

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