New answers tagged rabbis
I think another example might be Rabbi Tzodok haCohen of Lublin who was raised in a Lithuanian rabbinic family and switched to Chassidut. Though one might might argue that he wasn't yet a 'gadol be'Torah' when he made the change. https://en.wikipedia.org/wiki/Zadok_HaKohen
The Yismach Moshe was one of the misnagdim that switched to Chassidus https://en.m.wikipedia.org/wiki/Moshe_Teitelbaum_(Ujhel) And for the heretic list, although I'm not sure if it's really what the OP is looking for, Tzadok and Beitus went off the path of truth when they misunderstood Antigonus Ish Socho as brought in pirush hamishnayos from the Rambam in ...
The Mishna Brura is basically paraphrasing the Magein Avraham there (s.v. אין לש"ץ להמתין). This seems to be within the Magein Avraham's general approach of working to justify established customs that don't follow the Psak in Shulchan Aruch. Note that the Rama's source is quoted as Binyamin Zev #168. In that Teshuva he is specifically responding to a custom ...
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