Four-Power Authorities of Germany. Both were in West Berlin, Germany, and existed during the Cold War from 1948 to 1989. These were the Berlin Air Safety Center and Spandau Prison (which was demolished in 1987 when Rudolf Hess, the sole remaining prisoner, died). These two organizations were uniquely four-powered in that American, British, French, and Soviet authorities cooperated in their management. This was a far cry from the intensely adversarial relations the allies had with the Warsaw Pact leader in almost every other aspect of world affairs during this time. Both organizations remained low-profile and secretive during their existences to avoid highlighting
Spandau Prison wing of another larger, occupied prison, to releasing them; house arrest was also considered. Nevertheless, an official "refraining [o]rder" went into effect, forbidding the approaching of unsettled prisoners; and so, the prison remained exclusively for the seven war criminals for the remainder of its existence. Every facet of life in the prison was strictly set out by an intricate prison regulation scheme designed before the prisoners' arrival by the Four Powers – France, Britain, the Soviet Union and the United States. Compared with other established prison regulations at the time, Spandau's rules were quite strict. The prisoners' outgoing letters to