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Where can I read more about this? What poison were they using?

Methanol has been used, as has rubbing alcohol and methyl ethyl ketone. https://en.wikipedia.org/wiki/Denatured_alcohol for further reading.

https://en.wikipedia.org/wiki/Denatonium is used to make it unpalatable. Fun fact: the same chemical is also coated onto Nintendo Switch cartridges to discourage children from putting them in their mouths.

We used to use denatonium (Bitrex) in firefighting to test the efficacy of your face mask seal - you'd put on your mask, a filter, and a hood - Bitrex would be aerosolized into the hood and if you could taste it, there was not a good seal.

Nowadays we just measure pressure differentials.

It was specifically about methanol. Methanol wasn't explicitly used as a denaturation agent but ethanol methanol mixture sales were (forced to be) allowed. Can't find much in English but here's a brief story.

Methanol sales were banned in Finland prior to EU and Finland applied for the exemption already in the EU application in the early 1990s. It was finally granted in 2019. Probably around 500 people died and many got blinded meanwhile.

https://yle.fi/a/3-7841018

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