WASHINGTON — The Supreme Court has let stand a ruling that had overturned the state fraud convictions of former thrift executive Charles H. Keating Jr.

The justices refused Monday to reinstate the convictions, which were overturned last year by a federal trial judge and by the U.S. Court of Appeals in San Francisco. That court had ruled that Los Angeles Superior Court Judge Lance Ito had wrongly allowed the jury to convict Mr. Keating without deciding whether he intended to swindle investors.

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