Speakeasies were generally ill-kept secrets, and owners exploited low-paid police officers with payoffs to look the other way, enjoy a regular drink or tip them off about planned raids by federal Prohibition agents. Bootleggers who supplied the private bars would add water to good whiskey, gin and other liquors to sell larger quantities. Others resorted to selling still-produced moonshine or industrial alcohol, wood or grain alcohol, even poisonous chemicals such as carbolic acid. The bad stu...