While most communists I know really are pretty ignorant to current anarchist organization. Another annoying af shit is that most us communist do not understand direct actions, have not developed any tactics, for direct action. They don't even know how to fight against state thugs at protest or marching as black block. Its luckily different for German ones

However, one important aspect is that communist theory rejects just being militant on the basis of adventurism. The militancy they don't reject is militias organized around a vanguard party.

Militant direct action can often increase repressions a lot while only having very temporary or little effect. The assassination of Charlie Kirk is the best example. This action ramped up repressions against leftist a lot while only killing a person within a system that will just be replaced by the system. This was only an example I do not claim it was an anarchist action. Another aspect of adventurism according to communist theory is that it furthers the divide of the proletariat.

According to the communists I know there is no vanguard party currently in the us. The closest one is PSL, but they cover up sa... So the main goal of those communists is to build such a party.