The Service: The Memoirs of General Reinhard Gehlen by Reinhard Gehlen (1972)
"Our suspicions were largely confirmed when, independently of one another, we found out that Bormann and his group were operating an unsupervised radio transmitter network and using it to send coded messages to Moscow. When OKW monitors reported this, Canaris demanded an investigation; but word came back that Hitler himself had emphatically forbidden any intervention: he had been informed in advance of these Funkspiele, or "fake radio messages," and he had approved them" (p.71).
