Often referred to as the "Compatible Left", like others have described, the ruling class in the west cannot simply suppress Marxist thought outright, that would pierce the veil to some degree and cause a much harsher backlash. Instead, the goal is to remove the fangs of Marxist thought by demonizing AES countries, and silencing true radicals and revolutionaries. Leaving only what the CIA calls the "Compatible Left" behind.

This could either be a designed outcome, or it simply is how Marxism has developed under the harsh pressures of the Red Scare and the Cold War. Most of the revolutionary voices within America have either been assassinated or run out of the country, leaving only the more "compatible" thinkers within the country.

Another problem that likely contributes to this is literacy rates. 54% of adults in America have a literacy below a 6th-grade level, with 20% being below a 5th-grade level. The US ranks 36th in the world for literacy rates. I think many people might subscribe to the ideas of Marxism, without actually having read much if anything from the vast trove of Marxist literature. The Manifesto might be the only thing they've read, and it's hard to say they really understood its ideas. This leads to misconceptions and false conclusions by those who are under educated on the topic.

There is a reason why one of the first things that happens in almost any socialist revolution is the institution of reading programs, attempting to make the population more literate. Not only does higher literacy increase productive output, but it also ensures that people have the opportunity to read theory and become more educated on the ideas that the revolution was built on.