I doubt they're feds. Living in the US, I can guarantee that the level of indoctrination here is so absolute, you don't need to hire or recruit people to spread the propaganda. The kind of messages and symbols used in children and family shows, what they spin in the history books for public and private schools, and the news we're bombarded with daily, and how its filtered through social media, all reinforce the same narratives and prejudices, raising generations that don't even need to be paid to make propaganda - they think it's the truth. There are whole swathes of the population who think they're fighting some great crusade against tyranny by shitposting about China online.

It's annoying, and they are a threat to our ability to come together and communicate, but it doesn't necessarily mean the feds are even trying with them. The anti-communist hate in the US - and the racism against Chinese and Russians - is intense enough that they don't have to do anything other than keep the news cycles going. The libs do the rest.