Martin Bormann.
Martin Ludwig Bormann[1] (17 June 1900 – 2 May 1945) was a German Nazi Party official and head of the Nazi Party Chancellery. He gained immense power by using his position as Adolf Hitler’s private secretary to control the flow of information and access to Hitler. He used his position to create an extensive bureaucracy and involve himself as much as possible in the decision making.
https://en.m.wikipedia.org/wiki/Martin_Bormann