NEW YORK - The head of a private historical group says the government and NBC should have stopped a scantily clad Beyonce Knowles (news) from dancing in a "patently inappropriate" way on the steps of the tomb of President Ulysses S. Grant. Frank Scaturro, president of the Grant Monument Association, wrote letters Saturday to NBC, Secretary of the Interior Gale Norton and National Park Service director Fran Mainella over Beyonce's nationally televised July 4 performance. Saying the former Destiny's Child singer used "lascivious choreography" and barely dressed backup dancers, Scaturro's letter to NBC complained: "At that location, a certain decorum...