Leaders must be perfect. Therefore, according to Vedic civilization, at least three persons in the society… The first: the priest or the spiritual master, who are engaged in teaching people about religiosity, he must be perfect, above suspicion. Similarly, public leader, he must be also above suspicion. A brahmana… Brahmana means priest also. He must be above suspicion. And the king must be above suspicion. Then things will go on.

From Srila Prabhupada's lecture on Srimad-Bhagavatam 1.15.37 — December 15, 1973, Los Angeles