R.Yisrael Yitzhak, the Alexander Rebbe, did not grow a beard. (He died without any children.) There was no great love between Alexander and Ger. Gerer hasidim would mock R. Yisrael Yitzhak by referring to him as “the beardless Rebbe,” to which Alexander hasidim would retort, “This is preferable to a beard with no rebbe.”
Y.F.
Sanzer Rebbe