Antifa is supposedly a combination of communists and anarchists which are at opposite ends of the spectrum. I believe as you do though; the anarchists are not really anarchists at all; they are Marxist or communists with the facade of socialism sometimes to soften their extreme left bent.
Have you noticed yet how these Antifa people, when they are unmasked and recorded just don't seem right in the head? Not really grounded or well rounded? It's because leftism is a mental illness as we all so well know. What other possible reason would a person be so willing to give up all their freedom's and liberties so they can be taken care of but told what to do from cradle to grave by an omnipotent government?
Of course as we have seen over and over again; socialism, let alone communism, never works in the long run because they run out of confiscated money. Those who create wealth keep on doing it but they do it somewhere else where the socialists can't take their hard and fairly earned money or if they can't get away they just stop doing it. In the end the vast majority live at or just above the poverty line. Only the politically well connected do well and live high on the hog.