Noam Chomsky responded in 1989 to a woman questioning him about his general, longstanding criticism of so-called “Marxist analysis.” I found his response interesting:
Well, I guess one thing that’s unattractive to me about “Marxism” is the very idea that there is such a thing. It’s a rather striking fact that you don’t find things like “Marxism” in the sciences–like, there isn’t any part of physics which is “Einsteinianism,” let’s say, or “Planckianism” or something like that. It doesn’t make any sense–because people aren’t gods: they just discover things, and they make mistakes, and their graduate students tell them why they’re wrong, and then they go on and do things better the next time. But there are no gods around. I mean, scientists do use the terms “Newtonianism” and “Darwinism,” but nobody thinks of those as doctrines that you’ve got to somehow be loyal to, and figure out what the Master thought, and what he would have said in this new circumstance and so on. That sort of thing is just completely alien to rational existence, it only shows up in irrational domains.
So Marxism, Freudianism: any one of these things I think is an irrational cult. They’re theology, so they’re whatever you think of theology; I don’t think much of it. In fact, in my view that’s exactly the right analogy: notions like Marxism and Freudianism belong to the history of organized religion.
As found in Understanding Power: The Insdispensable Chomsky, eds. Peter R. Mitchell and John Schoeffel (New York: The New Press, 2002), 227.