I don't even think you could find a source for that anymore. I researched that nearly 20 years ago. Nowadays almost every search engine on the web will not even allow you to search for stuff like that, or even things like who is funding your political parties. There is a ton of stuff being censored nowadays. Also if you do find good sources, you should archive it and not reveal it to anyone on the internet, only in real life, because they will scrub it from the internet. This is the main thing they are using their surveillance to do as far as I can tell, find any information they don't want out there and scrubbing it. They are crowd sourcing it and are probably using AI to do it now, but that's still expensive per token so they are still relying a lot on mass surveillance to try to erase history.