Remembering to look for and ignore folks with that telltale indicator has made the fediverse so much more enjoyable.
I usually start people on the COINTELPRO entry on Wikipedia unless I'm explaining to someone that they're using the word "Anarchy" as a synonym for chaos because of a concerted effort by the authorities to depict anarchists as violent and out of control criminals.
My point being that actual CIA propaganda was a godsend to MLs. They can use the existence of it to deny anything bad about their movement to outsiders and while avoiding any painful self-reflection of their own failures. While somehow always refusing to accept that the USSR and other ostensibly socialists countries or countries opposed to the west would ever themselves engage in similar propaganda efforts.