איזביצא · Izbica and Radzin

Founded by Mordechai Yosef Leiner after a rupture with Kotzk in 1839 — the same year as the Kotzker's withdrawal, and the two events are not unrelated. Its line runs through his son and grandson to Zadok haKohen of Lublin, one of the most original writers in the whole tradition.

The branch that took determinism seriously. ⚠ Where Kotzk demanded that a person be true, Izbica asked whether a person is the author of what they do at all — and answered, at the deepest level, no. See h-w-mei-hashiloach. That is a live philosophical position and it is held inside a strictly observant community, which is the interesting part.