 The British and US intelligence services had set up clandestine anti-communist organisations supposed to "stay-behind" in case of a Soviet invasion.Walter Kopp was described by his own North-American handlers as an "unreconstructed Nazi," and the KIBITZ-15 network as "a group with Nazi tendencies" in CIA documents released in June 2006.In May 1945 Kopp wrote a letter to High Commissioner McCloy stating that he and a group of his friends were concerned over what might happen in case of a Russian invasion of Germany and wished to place themselves at the disposal of the Americans.