It's an old trick of antisemites. If you lurk antisemite pages or speak with antisemites, you'll find that a common talking point is the importance of Jews in the birth of communism (and the supposed link between Jews and communism in general), and likewise the importance of Jews in contemporary finance and politics. If you were to listen to such talking points, you'd argue that they were not actual anti-semites, but merely anti-finance-semites, anti-globalization-semites, anti-Soros-semites and the like.

Being the author of important pieces of literature unfortunately does not prevent one from holding wrong positions - a similar, well-known case is James Watson, co-discoverer of the DNA, Nobel Prize in Medicine, and yet holding eugenetic views.