Re: Bah!
Post 2. May 1934 the DAF (Deutsche Arbeiter Front - German workers front/group) became the "single union" for all workers until May 1945.
But before that the SA normally way not "the union". The unions where close to the then VERY Leftwing Social Democrats (1) and / or the slightly more left wing Kommunist Party. And organised in their own "combat groups" like the DKP "Rotfront"
(1) The (west)german socialists (SPD) became a modern "general party" only after the "Godesberger Programm" of 1959. Until then it sounded a lot like the (east)german SED