Page "Eugen Fischer" Paragraph 24

" That Fischer yielded to the pressure of his political patron and made active efforts to join the Socialist party from mid-1938 on was probably also a matter of calculation, and closely connected with his plans for reorganizing the institute, which were not to be realized without strong political cover.

[...] Reichführer SS Heinrich Himmler, when asked for an opinion by the staff of the office of the Führer's deputy, offered support for Fischer and Lenz in 1938 ... " Ultimately, with additional backing from Martin Bormann, Fischer officially became a Nazi on 12 / 12 / 1939.