It is the duty of the government or the king to see that the citizens are properly raised to the spiritual platform, Krsna consciousness. That is the duty of the government. Therefore the social division is brahmana, ksatriya, vaisya, sudra. Catur-varnyam maya srstam guna-karma-vibhagasah [Bg. 4.13]. The brahmanas should be ideal teachers of Vedic understanding. The ksatriyas should follow, even by force. Just like Pariksit Maharaja. As soon as he heard that Kali, these four principles of Kali, has already entered, he immediately took his bows and arrows and… "Who is that rascal, he is drinking? Kill him." That was kingdom. "Kill him, that rascal." So if one man is killed because he was drinking, then others will be very careful. That was king's duty. "Anyone who has got illicit sex, kill him. Anyone who is drunkard, kill him. Anyone who is eating meat, kill him." No other consideration. "Directly kill him." Then you see within a few years all these things will stop.

From Srila Prabhupada's lecture on Srimad-Bhagavatam 1.16.10 — January 7, 1974, Los Angeles