If I may paraphrase: “Extremism makes for strange bedfellows” especially when it advances ones agenda. I’ve also noted that some posters demonstrate absolutely deplorable taste in reference sites but, like the man said, “Tis all a matter of taste”.
Is there a factual error in that quote from Marxism in the United States, or did you simply intend to post ad hominem?
Not that you’ve shown a preference for addressing the substance of a post rather than indulging yourself in an opportunity for insult.