The freikorps, army, article 22, article 48
Those are the only ones i know as my modern class hasnt gotten too far yet. Im not entirely sure how article 48 contributed to the failure of of the weimar republic as i don't know what the president did with his power. But from my current knowledge, feikorps, army, and article 22 played a role in the weimar republic.
Sorry if im not much help. Just started this topic haha.