My Friend With Conditions

“When Indra understood that the sacrifice offered by the cowherd men in Vrindavana was stopped by Krishna, he became angry, and he vented his anger upon the inhabitants of Vrindavana, who were headed by Nanda Maharaja, although Indra knew perfectly well that Krishna was personally protecting them. As the director of different kinds of clouds, Indra called for the samvartaka. This cloud is invited when there is a need to devastate the whole cosmic manifestation.” (Krishna, The Supreme Personality of Godhead, Vol 1, Ch 25)