Erich Fellgiebel
Fritz Erich Fellgiebel (4 October 1886 – 4 September 1944) was a German Army general of signals and a resistance fighter, participating in both the 1938 September Conspiracy to topple dictator Adolf Hitler and the Nazi Party, and the 1944 20 July plot to assassinate Hitler. In 1929, Fellgiebel became head of the cipher bureau (German: Chiffrierstelle) of the Ministry of the Reichswehr, which would later become the OKW/Chi.