The Iron Front (German: Eiserne Front) was a German paramilitary organization in the Weimar Republic which consisted of social democrats, trade unionists, and democratic socialists. Its main goal was to defend social democracy against what was seen as anti-democratic, totalitarian ideologies on the far-right and far-left. The Iron Front chiefly opposed the Sturmabteilung (SA) wing of the Nazi Party and the Antifaschistische Aktion wing of the Communist Party of Germany. Formally independent, it was intimately associated with the Social Democratic Party of Germany (SPD). The Three Arrows, originally designed for the Iron Front, became a well-known social democratic symbol representing resistance against monarchism, Nazism, and communism during the parliamentary elections in November 1932. The Three Arrows were later adopted by the SPD itself.
IMO the Democratic Party is just an institution. It can be taken over the same way MAGA took over the GOP. I agree a multi-party system would be better, but that requires Ranked Choice Voting and I’m not sure if even regular voting is safe right now (although this is an opportunity to reform voting into popular vote + RCV, since it’s clear the current voting system isn’t enough to protect democracy). But I digress.
With the current system you need progressives to primary the crap out of corpo Dems. Parties don’t have ideologies, people do. Change the people and you change the party. (Incidentally, this is what Project 2025 is trying to do with the state: replace all the government workers who oppose them with Trump worshippers.)