Quote from Srila BV Narayana Goswami Maharaja (June 1997, Badger, California):

“So, my instruction is, as is that of Srila Rupa Gosvami, that we should never criticize anyone. If someone is doing something bad, then he is doing something bad for himself. But we should not criticize anyone. If you criticize anyone thinking, “This is wrong, that is wrong, this fellow is very bad, what he is doing is very bad…etc”. Then all of those bad qualities will enter into your hearts, and Yamaraja will come for you first, to punish you. Always try to think and meditate upon the good qualities of Vaisnavas who are chanting and remembering the name, form, and pastimes of Krishna. Sometimes I hear that some of my disciples are criticizing some of the leaders and devotees of ISKCON™. I want this to stop! I want that no-one should be criticized, whether they are part of ISKCON™ or not, whatever cast or creed they may be, whether they are bad or not, you should not criticize them. Always try to remember and glorify devotees of Krishna. This is the instruction of Srila Rupa Gosvami and is also the instruction of Srila Bhaktivedanta Swamiji. So always be careful of this.”