Rabbi Yosef Yitzchak Schneerson, also known as “Der Frierdiker Rebbe” (The Earlier Rebbe) to distinguish him from his successor, Rabbi Menachem Mendel Schneerson, was the sixth leader of the Chabad-Lubavitch movement. Living in tumultuous times, he shifted the center of the movement from its Eastern European origins to its current headquarters in the United States.
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