The biggest threat to any left wing movement has and always will be the CIA, their brutality is than used to prove that leftist movements are "unpopular".

Doesn't even need to be too left wing, JFK put a dictatorship in Brazil cause the center left president wanted to trade with China and refused to invade Cuba

yeah, and not just leftist. you can have the most liberal and bourgeois-backed nationalist project just to secure some kind of national sovereignty and there will still be a coup. Case point: Iran and Mosaddegh.

Imperialism will sap the wealth of countries and peoples for short term gains, regardless of the economic system.

Not only that but the word "communist" is brings out so much hatred to people in the US. Perfect propaganda.