The clearance story was more fraught. As Department historians pursued the records needed to document decision-making processes across agency lines, a wider range of policymakers participated in the clearance process to determine what information could be released or needed to be withheld in the interest of national security. Declassification disputes surrounding “controversial” FRUS volumes embodied conflicting perspectives and priorities that could take years – in one case decades – to resolve, but, until the 1980s, they usually satisfied transparency advocates. However, when State Department historians in the late 1970s and 1980s began to prepare the volumes covering the 1950s -- the “coldest phase of the Cold War” -- secrecy prevailed.
The FRUS series manifested the same tensions between openness and security that confronted the U.S. Government overall in the decades following World War II. From a comparative perspective, FRUS made the United States more transparent about historical foreign policy decision-making than other major international powers. At the same time, national security institution-building within the U.S. Government empowered decisionmakers who displayed increasing reluctance to take risks to promote greater understanding of the past.