capitalism’s worst enemy has been socialism, most vocally communism.
what was the counteracting -ism to feudalism during the ages? was the counteracting -ism a different one at some point?
all replies welcome, serious textwalls and unserious oneliners alike vice versa


I wouldn’t say that feudalism “perfected” slavery. It can be argued that chattel slavery a few centuries later made it more effective.
However, feudalism did well in controlling the food surplus and paying the military at a time when the organizational ability to control wide swaths of land had diminished. Mentioning Japan as an outlier in time, feudalism also brought a lot of political stability by locking down society.
However, as you noted, capitalism was the enemy of feudalism. Capitalism could organize itself in ways that feudalism never could and made capital investments both easier and more lucrative.