Remember, the social Democrats sided with the Nazis over the socialists. They’ve done it every time they’ve been given the opportunity, and will continue to do so as many times as people fall for their shtick.
“The master's tools will never dismantle the master's house."
-Audre Lorde
Gustav Noske, the "Bloodhound of the SPD", used Freikorps (proto-fascist and/or monarchist) militias to kidnap and murder communists, who at the time were more influential than the SPD in many parts of the country.
And this should inform modern political theory because?