The late Rabbi Marvin Antelman, who was the chief justice of the Orthodox Rabbinical Court of New York, investigated Karl Marx and the lineage of his thinking and claims that it arose from a feud, between rabbinical families going all the way to the teachings of the Jewish false messiah Sabbatai Zevi in 1666.
This work is very eye-opening. It appears that just as Western Christianity has been seriously ruptured since the Reformation, so too has Judaism suffered an enduring rupture as well. This rupture was precipitated by the Sabbatai Zevi and his teachings that people should deliberately lead immoral lives so as to hasten the day that the true Jewish Messiah would appear. He was brought to this conclusion after being influenced by English merchants in Salonika who believed in millenniarism and expected Jesus to return in the year 1666. He ultimately converted to Islam, under the threat of death from the Sultan of Turkey.
After reciting the names of prominent rabbis and their families, he traces back Marx's family lineage through his father, who was the chief rabbi of the German city of Trier, back the time of Jacob Frank and those rabbinical families who became his followers. Jacob Frank was a charismatic disciple of Sabbatai Zevi in the 18th Century, who had a large intellectual following in Europe, including the supposed founder of the Illuminati, Adam Weishaupt.
This is a very interesting read, but his ideas that he propounds not really that controversial. This is surprising, in light of the evident efforts to suppress it. Among Rabbi Antelman's claims is that the mother of Israeli Prime minister Rabin, who was assassinated by a right-wing Israeli, was in the NKVD and that he and the group that he belonged to murdered numerous anti-communist Zionists in Israel from 1940 forward until Ben Gurion put a stop to it when he proclaimed independence. He intimates that one reason Rabin may have been assassinated was that he was being given a taste of his own medicine.