Between 1950 and 1951, the FBI was involved in planning for and beginning to implement a program to identify and train personnel who would act in a clandestine capacity in Alaska should the USSR invade the area.
This Stay Behind Agent Program, also called STAGE by the FBI, was to be done in concert with other government agencies. The FBI abruptly ended its involvement in September of 1951; the reason why is not indicated in the materials released.
Air Force Office of Special Investigations (AFOSI)
Air Force Office of Special Investigations (AFOSI) Declassified Documents [703 Pages, 26.9MB] – Special thanks to GovernmentAttic.org for receiving this batch of documents.