The word ācārya means “teacher. “The special function of such a teacher is to make people Kṛṣṇa conscious. A bona fide teacher following in the footsteps of great ācāryas have no other business than to spread the principles of Kṛṣṇa consciousness all over the world. The real qualification of an ācārya is that he presents himself as a servant of the Supreme. Such a bona fide ācārya can never support the demoniac activities of atheistic men who present themselves as God. It is the main business of an ācārya to defy such imposters posing as God before the innocent public.
Ref >> Srila Prabhupada Vani.