I am not going to let Marx off the hook, he was one of the biggest hypocrites who probably ever lived. For all of his smug self-satisfaction of his own intellect and theories, he did not even come remotely close to living in a manner that wasn't self-serving. As to Marx's opinions on Jews, it is probably to you a distinction without a difference, but Marx's atttitude was not a biologically based ethnic hatred, which is the general definition of Anti-Semitism.
Marx’s belief in the abolition of private property, family, religion and borders was absolute. When understood in the context of the ends justifying the means, then there is no “revisionism” and everything Antifa does, never mind the Bolsheviks, Maoists, Khmer Rouge, Viet Cong, any of them, can be predicted in light of that ideology.
Except your generalization is incorrect. These groups are obsessed with the concept of "praxis" and have always considered the label "Revisionist" as a slur. Once again, this shows signs of Post-Marxism, not actual Marxism, or even Marxist-Leninism. These groups will violently attack each other because of other ideological or praxeological disagreements they have. The modern left actually does not get along with Communists of any type because of various reasons. Antifa figures have sworn, "Tankies get the bullet" for being "homophobic" and "class reductionist". Any actual Marxist would consider the concept of being "class reductionist" absurd. This term comes from Post-Structualist and Critical Theory, which is Post-Marxist.