Srila Prabhupada said:

Everyone is papi (sinful) but one should not sin intentionally. Once taken shelter of Caitanya Mahaprabhu, that should be stopped. How to prevent these unfair means? I have given all the guidelines to the GBC. It is up to them. Whatever we do should be based on purity and honesty. If one does on one's whimsical motivation, that is not good.

From a letter, November 11, 1977