The Prohibition Era was a time of confusion among the American people, because they were being denied a beverage that they had been drinking casually for years. Many bootleggers began selling alcohol, and they made a fortune.
In order to stop bootleggers from selling alcohol, and to stop the public from consuming it, the US government decided that they should put small doses of poison in industrial alcohols. This tactic was supposed to just make people sick, so they would stop drinking alcohol. The bootleggers however, began hiring chemists to extract the poison.
The US government went the extra mile and started added enough poison into the alcohol that it couldn't all be extracted, and, unfortunately, up to 10,000 people died as a result. Ironically, the government was trying to protect the public from the dangers of excessive alcohol consumption, and, instead, they ended up killing 10,000 of their citizens.