FBI Report, "Owen Lattimore, Internal Security - R, Espionage - R," September 8, 1949 (FBI File: Owen Lattimore, Part 1A), p. 2 (PDF p. 7): Six years prior to the Barmine revelations in his 1948 interview, the FBI had already compiled a thick security dossier on Lattimore at the onset of World War II, recommending that he be put under "Custodial Detention in case of National Emergency."
