I do not think the Soviet can be faulted, as Marxism is well rooted in American mentality. Many a person like Alinsky got here, and the kids and grand-kids carry the ideas, as Progressives, Fabian Socialists, or whatever.
But Stalin said Marxism could not easily take root, here, because of our personal ethics, strong faith and families. So it behooves the believers to attack those 3 parts of our culture, here.
Seems they are into that attack 24/7.
While Marxists choose the slogan 'Forward', we can see the regressive harm Marxism does, and the poverty it redistributes.