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Some - a misguided few - believe that. The Rebbe himself never claimed that position and tried to discourage people from going down that path.

“Many in the Lubavitch sect of Judaism believe dead Rebbe Menachem Mendel Schneerson to be the Jewish Messiah who will rise from the dead some day. Yet they reject their true Messiah Jesus Christ who did indeed die and rise from the dead. They are a synagogue of Satan…”
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After all, we Jews have a lot of bad experiences related to false messiahs, starting with a sect of people who claimed that a dead carpenter qualified for that position without having brought peace, ingathering the Jews, building the 3rd Temple (kind of difficult when the 2nd was still standing) and did not bring universal recognition of the God of Abraham, Isaac and Jacob S the one and only God. Oh, and they also made the blasphemous mistake of assigning divinity to a mere man - NOWHERE in the Tanach is the Final Redeemer (Messiah) described as divine in anyway. Yeah , the Jewish experience with that group has generally not been even remotely close to a good one, especially among those referring to them as the “synogogue of Satan.”