Sam2:
mw13: One of the main Taanos on early Chassidim that many thought messed with Ikkarei Emunah was Aveirah Lishmah.
How would the Chassidish position on aveirah lishmah, which the Misnagdim vehemently disagreed with, be in conflict with any of the 13 principles of the Rambam?
And where does the Gra specifically deal with this issue?