They are the secrets of Mexico's "dirty war," people known as the desaparecidos, the disappeared. The window of Mexican glasnost has finally been opened: information from old government files about the kidnaps, torture, and the killing of leftists who challenged authority in the 70's and 80's is finally available. It's access human rights advocates have long pushed for, despite threats from the old guard, but the new government of Vicente Fox says it's time to prosecute the crimes of the past. These are the secrets of the PRI, the party that ruled Mexico for seven decades, and there will be political costs to uncovering the whole truth.