In 1864, Congress had authorized a third series of fractional currency notes. The five-cent note was to bear a portrait of "Clark", but Congress was appalled when the issue came out not bearing a portrait of William Clark, the explorer, but Spencer M. Clark, head of the Currency Bureau. According to numismatic historian Walter Breen, Congress's "immediate infuriated response was to pass a law retiring the 5¢ denomination, and another to forbid portrayal of any living person on federal coins or currency." Clark only kept his job because of the personal intervention of Treasury Secretary Salmon P. Chase.