In 2003, retired Russian intelligence official General Julius Kobyakov disclosed that it was he who had actually searched the files for Volkogonov. Kobyakov stated that Hiss did not have a relationship with SVR predecessor organizations, although Hiss was accused of being with the GRU, a military intelligence organization separate from SVR predecessors. In 2007, Svetlana Chervonnaya, a Russian researcher who had been studying Soviet archives since the early 1990s, argued that based on documents she reviewed, Hiss was not implicated in spying. In May 2009, at a conference hosted by the Wilson Center, Mark Kramer, director of Cold War Studies at Harvard University at the John F. Kennedy School of Government, stated that he did not "trust a word says", At the same conference, historian Ronald Radosh reported that while researching the papers of Marshal Voroshilov in Moscow, he and Mary Habeck had encountered two GRU (Soviet military intelligence) files referring to Alger Hiss as "our agent".