There used to be a very active forum on clandestine chemistry (The Hive) that eventually got shut down when Strike (who ran the forum) got busted. I cant remember the details (it’s been almost 20 years) but I think 60 Minutes did a report on it and he was anonymously interviewed? He also wrote a couple books on it. The Rhodium archives were also a nice collection of scientific papers on synthesis routes combined with…
https://the-hive.archive.erowid.org/
also see https://archive.erowid.org/