Karl marx was an influential german thinker and revolutionary who pioneered the idea of 1. capitalism 2.utopianism 3.communism 4.mysticism

The answer would be 3. Communism.
Essentially, he called it Marxism- where the population shares everything. This idea was expanded upon to create excessive communism, which grew to be used in Russia and China.

I Hope this Helps!

You don’t have to names or other options up here so idk dude