There were definitely attempts at promoting nazi ideas in the west, both in the us and western europe. But unlike modern day it was quickly counteracted. Today you dont need a specific political ideology to sow discontent and damage free societies. All you need is to indoctrinate naive cousins in any toxic topic they may be ready to believe. At scale that causes polarisation, mistrust, conflict and eventually political change. A bit like poisoning the body just enough so it doesnt function properly. The question is how do you police content in such way that it doesnt block legitimate opposing ideas.