yadunam kadanam cakre
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
Sukadeva Gosvami said: Under the protection of Magadharaja, Jarasandha, the powerful Kamsa began persecuting the kings of the Yadu dynasty. In this he had the cooperation of demons like Pralamba, Baka, Canura, Trnavarta, Aghasura, Mustika, Arista, Dvivida, Putana, Kesi, Dhenuka, Banasura, Narakasura and many other demoniac kings on the surface of the earth.
Purport by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
This verse supports the following statement given by the Lord in Bhagavad-gita (4.7-8):
yada yada hi dharmasya
glanir bhavati bharata
tadatmanam srjamy aham
vinasaya ca duskrtam
sambhavami yuge yuge
“Whenever and wherever there is a decline in religious practice, O descendant of Bharata, and a predominant rise of irreligion — at that time I descend Myself. To deliver the pious and to annihilate the miscreants, as well as to reestablish the principles of religion, I Myself appear millennium after millennium.”
The Lord’s purpose in maintaining this material world is to give everyone a chance to go back home, back to Godhead, but kings and political leaders unfortunately try to hinder the purpose of the Lord, and therefore the Lord appears, either personally or with His plenary portions, to set things right. It is therefore said:
garbham sañcarya rohinyam
tasyah kuksim gatah krsno
dvitiyo vibudhaih stutah
“Krsna appeared in the womb of Devaki after transferring Baladeva to the womb of Rohini by the power of Yoga-maya.” Yadubhih sa vyarudhyata. The kings of the Yadu dynasty were all devotees, but there were many powerful demons, such as Salva, who began to persecute them. At that time, Jarasandha, who was Kamsa’s father-in-law, was extremely powerful, and therefore Kamsa took advantage of his protection and the help of the demons in persecuting the kings of the Yadu dynasty. The demons naturally appeared more powerful than the demigods, but ultimately, because of help received from the Supreme Personality of Godhead, the demons were defeated and the demigods triumphant.