Wikipedia
Niezhin (Hasidic dynasty)
The Niezhin branch of the Chabad Hasidic movement was founded after the death of the third rebbe of Chabad, Rabbi Menachem Mendel Schneersohn. The group was one of several groups that sought to succeed Rabbi Menachem Mendel, whose death created a dispute over his succession. The group was led by its founder, Rabbi Yisroel Noach of Niezhin, a son of Rabbi Menachem Mendel.