Cite? There was plenty of home distilled moonshine during prohibition obviously but I’ve never heard of it being passed off as branded liquor. AFAIK almost all the poisonings were just like that recent case in Cambodia where poisonous industrial alcohol was added to liquor by the smugglers* as it was cheap and easily available (and wouldn’t kill all your customers if you didn’t add too much, just like Fentanyl in drugs nowadays)
‘*’ - or the US government