Prior to the Indonesian genocide of the 1960s, where the CIA installed a military dictatorship that the lives of millions, the country’s communist party technically did warn about the peril. The problem was that this warning had been made in a reactive way, and therefore wasn’t nearly enough to prepare the people to fight back.
I heard they mostly just pass out newspapers. The only one I’ve met was basically a run of the mill conservative. Anti-Ukraine, anti-vaxx, anti-blm, etc.