Lord Parasurama killed all the ksatriyas twenty-one times

SB 1.3.20, Translation and Purport: In the sixteenth incarnation of the Godhead, the Lord [as Bhṛgupati] annihilated the administrative class [kṣatriyas] twenty-one times, being angry with them because of their rebellion against the brāhmaṇas [the intelligent class]. The kṣatriyas, or the administrative class of men, are expected to rule the planet by the direction of the intelligent class of men, who give direction to the rulers in terms of the standard śāstras, or the books of revealed knowledge. The rulers carry on the administration according to that direction. Whenever there is disobedience on the part of the kṣatriyas, or the administrative class, against the orders of the learned and intelligent brāhmaṇas, the administrators are removed by force from the posts, and arrangement is made for better administration.

SB 1.3.28, Purport: Similarly, the incarnations of the Lord display limited powers because so much power is needed at that particular time. For example, Lord Paraśurāma and Lord Nṛsiṁha displayed unusual opulence by killing the disobedient kṣatriyas twenty-one times and killing the greatly powerful atheist Hiraṇyakaśipu. Hiraṇyakaśipu was so powerful that even the demigods in other planets would tremble simply by the unfavorable raising of his eyebrow.

SB 1.9.6-7, Purport: Paraśurāma, or Reṇukāsuta: He is the son of Maharṣi Jamadagni and Śrīmatī Reṇukā. Thus he is also known as Reṇukāsuta. He is one of the powerful incarnations of God, and he killed the kṣatriya community as a whole twenty-one times.

SB 2.7.22, Purport: Those going against the prescribed rules and regulations of conditional life are called brahmojjhita-pathas, or persons going against the path of the Absolute Truth, and they are liable to be punished. Lord Paraśurāma, the incarnation of the Personality of Godhead, appeared in such a state of worldly affairs and killed all the miscreant kings twenty-one times. Many kṣatriya kings fled from India to other parts of the world at that time, and according to the authority of the Mahābhārata, the kings of Egypt originally migrated from India because of Paraśurāma's program of chastisement. The kings or administrators are similarly chastised in all circumstances whenever they become godless and plan a godless civilization. That is the order of the Almighty.

SB 9.15 Summary: The son of Jamadagni was Rāma, or Paraśurāma. When a king named Kārtavīryārjuna stole Jamadagni's desire cow, Paraśurāma, who is ascertained by learned experts to be a saktyāveśa incarnation of the Supreme Personality of Godhead, killed Kārtavīryārjuna. Later, he annihilated the kṣatriya dynasty twenty-one times. After Paraśurāma killed Kārtavīryārjuna, Jamadagni told him that killing a king is sinful and that as a brāhmaṇa he should have tolerated the offense. Therefore Jamadagni advised Paraśurāma to atone for his sin by traveling to various holy places.

SB 9.15.24, Purport: Paraśurāma, the incarnation of the Supreme Personality of Godhead, killed Kārtavīryārjuna because Kārtavīryārjuna was too proud. One may possess unusual opulence in this material world, but if one becomes puffed up and acts whimsically he will be punished by the Supreme Personality of Godhead. This is the lesson to learn from this history, in which Paraśurāma became angry at Kārtavīryārjuna and killed him and rid the entire world of kṣatriyas twenty-one times.

SB 9.16 Summary: When Jamadagni was killed by the sons of Kārtavīryārjuna, as described in this chapter, Paraśurāma rid the entire world of kṣatriyas twenty-one times. The sons of Kārtavīryārjuna, however, remembering the death of their father, wanted to take revenge against Lord Paraśurāma, and therefore when Paraśurāma was absent from the āśrama, they killed Jamadagni, who was meditating on the Supreme Personality of Godhead. When Paraśurāma returned to the āśrama and saw his father killed, he was very sorry, and after asking his brothers to take care of the dead body, he went out with determination to kill all the kṣatriyas on the surface of the world. Taking up his axe, he went to Māhiṣmatī-pura, the capital of Kārtavīryārjuna, and killed all of Kārtavīryārjuna's sons, whose blood became a great river. Paraśurāma, however, was not satisfied with killing only the sons of Kārtavīryārjuna; later, when the kṣatriyas became disturbing, he killed them twenty-one times, so that there were no kṣatriyas on the surface of the earth.

SB 9.16.18-19, Translation and Purport: With the blood of the bodies of these sons, Lord Paraśurāma created a ghastly river, which brought great fear to the kings who had no respect for brahminical culture. Because the kṣatriyas, the men of power in government, were performing sinful activities, Lord Paraśurāma, on the plea of retaliating for the murder of his father, rid all the kṣatriyas from the face of the earth twenty-one times. Indeed, in the place known as Samanta-pañcaka he created nine lakes filled with their blood. Paraśurāma is the Supreme Personality of Godhead, and his eternal mission is paritrāṇāya sādhūnāṁ vināśāya ca duṣkṛtām [Bg. 4.8]—to protect the devotees and annihilate the miscreants. To kill all the sinful men is one among the tasks of the incarnation of Godhead. Lord Paraśurāma killed all the kṣatriyas twenty-one times consecutively because they were disobedient to the brahminical culture. That the kṣatriyas had killed his father was only a plea; the real fact is that because the kṣatriyas, the ruling class, had become polluted, their position was inauspicious.

Krsna Book 82: The Samanta-pañcaka pilgrimage site is celebrated because Lord Paraśurāma performed great sacrifices there after killing all the kṣatriyas in the world twenty-one times. When Lord Paraśurāma killed all the kṣatriyas, their accumulated blood flowed like a stream. Lord Paraśurāma dug five big lakes at Samanta-pañcaka and filled them with this blood. Lord Paraśurāma is viṣṇu-tattva. As stated in the Īśopaniṣad, viṣṇu-tattva cannot be contaminated by any sinful activity. Yet although Lord Paraśurāma is fully powerful and uncontaminated, in order to exhibit ideal character He performed great sacrifices at Samanta-pañcaka to atone for His so-called sinful killing of the kṣatriyas. By His example, Lord Paraśurāma established that the killing art, although sometimes necessary, is not good. Lord Paraśurāma considered Himself culpable for the sinful killing of the kṣatriyas; therefore, how much more culpable are we for such abominable unsanctioned acts. Thus, from time immemorial the killing of living entities is prohibited all over the world.

Lecture on BG 2.32 -- London, September 2, 1973: The brāhmaṇas will examine whether the kṣatriyas are doing their duty nicely. Just like Paraśurāma, when he saw that all the kṣatriyas have become rascals, he wanted to kill them all. You know that. Twenty-one times he killed.

Lecture on SB 1.3.20 -- Los Angeles, September 25, 1972: So sometimes, when it happens so that the administrators, nṛpān, the kings, were neglectful in their proper duty, so it was so much aggravated, at that time Jamadagni, Bhṛgupati, he took the matter, took his sword. He was a brāhmaṇa, but to chastise these irresponsible kings, He killed them, killed them seven into three times, twenty-one times.

Lecture on SB 1.16.2 -- Los Angeles, December 30, 1973: You know that Jāmadagnya, Paraśurāma, when he saw that the kings were not responsible, he killed the whole kṣatriya family for twenty-one times. So that was the government. If the brāhmaṇas would see that the kṣatriyas, the kings were not ruling properly according to the Vedic principle, sometimes they would kill the king.

Lecture on SB 5.5.20 -- Vrndavana, November 8, 1976: The brāhmaṇa should live by education, by knowledge. Everyone will honor them. They will give advice to the śūdras, er, to the kṣatriyas. When Paraśurāma killed eleven..., twenty-one times all the kṣatriyas, his father chastised him that "This is not the business of a brāhmaṇa. My dear son, you are so angry, you have killed all the kṣatriyas and you have killed Kārtavīryārjuna by anger. Oh, you have done great sinful activities. It is not the business of the brāhmaṇa. Therefore you should retire for some time and go to holy places to counteract your sinful activities." This was spoken to Paraśurāma by his father.

Lecture on CC Madhya-lila 20.367-84 -- New York, December 31, 1966: Under two, these two missions, the Lord comes, incarnates, descends. And Paraśurāma was supposed to kill the duṣṭa, the wicked kṣatriyas, when they forgot to rule over the world as bona fide kṣatriyas. They..., they..., they were killed twenty-one times, and it is mentioned in the Mahābhārata during that killing process, many kṣatriyas fled from, fled away from India and they settled in other parts of the world, especially in Europe. It is mentioned in the Mahābhārata. So Paraśurāma was especially meant, vināśāya ca duṣkṛtām, to kill the miscreants.

Varaha-dvadasi, Lord Varaha's Appearance Day Lecture Dasavatara-stotra Purport -- Los Angeles, February 18, 1970: Paraśurāma, twenty-one times He made a massacre propaganda for killing all the kṣatriya kings. The kṣatriya kings were very much dishonest at that time, so he killed them for twenty-one times. They fled from here and there. And from the history of Mahābhārata it is understood, at that time some of the kṣatriyas fled and took shelter in the European side.

Morning Walk -- December 12, 1973, Los Angeles: Prabhupāda: Ah. Because the kṣatriyas were not doing exactly, he twenty-one times massacred them. Finish! And those who, kṣatriyas, fled from India, they came to Europe. So the European means they are coming from the kṣatriya descendant, but they have forgotten their own culture. Indo-aryan.

Room Conversation -- February 25, 1977, Mayapura:

Prabhupāda: To kill "demon-crazy," LSD. (laughs) Yes, that is my mission. That is Kṛṣṇa's mission, paritrāṇāya sādhūnāṁ vināśāya ca duṣkṛtām [Bg. 4.8], to kill all these demons, crazy demons. I have no such power; otherwise I would have killed them. Either establish Kṛṣṇa conscious government or kill them-bas, finish. I would have done that, violence.

Tamāla Kṛṣṇa: Yes, when good argument fails...

Prabhupāda: Kill them. Finish. Just like Paraśurāma did. Kill all them, twenty-one times.

Letter to Rupanuga -- Tirupati 28 April, 1974: The GBC must be vigilant by following the regulative principles and teach by ideal character the presidents of the centers, and the presidents by their ideal character must teach the others then automatically all members of the whole institution will be ideal to the human society. Then we can dictate to administrators or sometimes take hold of the administration. In the absence of competent leaders we may take the post. But we must be very careful in the flow of the political movement we may not forget our ideal life. For example, Parasaram was a Brahmin but when he found the ksatriyas were mismanaging he killed them twenty-one times and some of them fled to European countries. This is the history. So far we are concerned we shall keep ourselves in ideal brahminical position and if need be if no ksatriya or Vaisya is here we can take up their work as emergency. Our business is to create ideal ksatriyas and vaisyas but beyond that our real business is to keep ourselves as ideal Brahmins. If we are not ideal we cannot create others as ideal.