There are numerous reports that the late R. Elazar Shach fought a bitter battle against Chabad, even using harsh language in his campaign. If these reports are true, I wonder why this rabbi was so angry with Chabad? This cannot have been simple opposition to Hasidism as his attack was directed at only one Hasidic group. Nor could it have been directed against the veneration of the last rebbe as the messiah as this is not and never was the dominant view of the Chabad community.
A similar question was asked and closed here - judaism.stackexchange.com/questions/70987/…– DovDec 19, 2021 at 15:22
1I think such a question is walking a delicate tightrope as it will very likely give rise to needless loshon hora for two chashuve rabbonim.– DovDec 19, 2021 at 15:26
1The key word is 'needless' - some people think that the more puzzling parts of the rabbis should be understood and some people prefer to pretend that that rabbis never do or say things which leave ordinary Jews confused.– user19234Dec 19, 2021 at 15:30
7It has almost everything to do with Chabad Messianism. I suggest you read what you can find on the matter from the internet as well as what's in the Telushkin book if you have it. Chabad's "official" stance is that the Rebbe is not the Moshiach, however coming from Chabad I will have you know it is much, much more widespread than Chabad lets on. Contact me thru the info in my bio, I'd love to talk more about it.– ezraDec 19, 2021 at 15:36
1All chassidus was controversial, some would say it still is.– pcozDec 21, 2021 at 2:52
Nor could it have been directed against the veneration of the last rebbe as the messiah as this is not and never was the dominant view of the Chabad community.
Firstly I wish, wish, wish that this were the case.
Secondly it wasn't only the messianism. It was also their lifting of their rebbe almost to the point of deification R'L
See here for more details
Interesting, even though that’s still not heresy is it? As long as they keep the Law. Many rabbis thought they were the messiah...the Rebbe didn’t Dec 19, 2021 at 19:32
It's not entirely clear that he didn't think of himself as being moshiach, based on cryptic statements he made that his followers may or may not have misinterpreted.– MenachemJan 14, 2022 at 3:39