Bhaktadas: In the middle of 1972, there was no plainclothes sankirtana. Everything was straight saris, dhotis, tilak, and, "Here, we're from Hare Krishna, please read a book about Krishna." Around that time, Srila Prabhupada wrote me a letter saying, "Make sure that you sell books by preaching, not by cheating." I was taken aback by this. I said, "What does he mean? He's written 'cheating.' What are we doing?"
I wrote and asked, "Srila Prabhupada you mentioned, 'Sell books by preaching, not by cheating.' What do you mean?" He replied that if you act with the consciousness that Krishna is the Supreme Proprietor, the only Enjoyer, and the dear most Friend of all living beings, then you are not cheating. But if you act in any other consciousness, you are cheating.
He didn't specifically say that we were lying on sankirtana to collect money and distribute books. But my understanding was that as Supersoul, Krishna is within us and within all others, and when we're on sankirtana we should be trying to please Him.