EFF Database of Police Agencies and Tech Tools They Use to Spy on Communities

You might be able to glean sources like court records for evidence of things like corporate data sources used at trial, or perhaps other secondary sources. Finding and compiling that data is much less straightforward than that which is manadated, at least in theory, to be in the public record.

The EFF has always been aimed at the government anyway, and its taken decades of pressure to reveal what it does. A different organisation is probably necessary to dedicate itself to corporate overreach.

https://www.eff.org/wp/behind-the-one-way-mirror

"Behind the One-Way Mirror: A Deep Dive Into the Technology of Corporate Surveillance".

It should also be noted that the police (along with governments) have a lot more power to affect your life in ways that even "corporate mega corporations" cannot. This can be read as it being more important to affect change and keep people accountable who can have more of an impact on your life.

Another useful article: https://www.eff.org/nsa-spying

Even with supporting evidence, your statement seems far too broad to be accurate.