Gargamuni Dasa: In 1968 Rayrama Dasa editor of Back to Godhead wanted to print ISKCON’S distaste for cow-slaughter by showing a man with cow-face slaughtering a cow with a man-face. Srila Prabhupada stopped this. Srila Prabhupada said depicting this picture is indirectly advertising cow-slaughter.
A man with cow-face slaughtering a cow with man-face
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Reference: Facebook post of Gargamuni Dasa