OPINION Page had been working as an “operational contact” for what Horowitz calls another U.S. agency from 2008-2013. Page has said this is the CIA, which Horowitz doesn’t confirm, though he does say that Page was reporting on his Russian contacts, which the agency deemed credible. In other words, the FBI was using Page’s Russian contacts as evidence against him to the FISA court even as the other agency considered his reports on those Russians to be helpful to the U.S. Horowitz says the FBI never disclosed this information to…