The Viznitz tail doctrine. If this is not a cult what is?
Even if it seems that the Rebbe is transgressing a clear halokhoh from the mishneh beruroh, does not pray in public or not at all, or even if he does things that our forefathers did not do such as igniting a cigar in public or in the midst of a holy discourse –he [the hosid] remains clinging to his holy and pure rebbe… with a fealty of heart and soul, to him and to his pure path.
Believe it or not, in the recent Tail Doctrine campaign R. Mendelle taught his hasidim a new song to be sung before reciting the Psalms and after evening toroh lessons:
“we believe in the holy opinion of the holy Yeshuos Moshe (viz. his father, so named after a book that he composed), namely shvantzonus (the practice of being a tail; tail-ism)”
From The Jewish Worker, here.