A Russian researcher, delving anew into once-secret Soviet files from the Cold War, says she has found no evidence that Alger Hiss spied or that Soviet intelligence had any particular interest in him. In a speech to be delivered at a New York University symposium Thursday, Svetlana A. Chervonnaya says neither Hiss' name nor his alleged spy moniker, Ales, appears in any of dozens of documents from Soviet archives that she has reviewed since the early 1990s. A copy of the speech was made available to The Associated Press on Wednesday. Calling her efforts "proving the negative," Chervonnaya says "a...