I've stated before and again that There Is No Alternative to the pre-WWI SPD model for left politics and organizing the "alternative culture."
Well, look at a historic enemy par excellence of the left:
Shanker Satyanath, Nico Voigtlaender, Hans-Joachim Voth wrote:
We collect new data on the density of associations in 229 German towns and cities. Denser networks of clubs and societies went hand-in-hand with a more rapid rise of the Nazi Party. Towns with one standard deviation higher association density saw at least 15% faster Nazi Party entry.