Privacy Rights Clearinghouse has been sounding the alarm about data brokers and advocating for stronger consumer protections for decades.
Until recently, there was little information available about data brokers. It's only because of state law developments that began with Vermont’s pioneering data broker registry law in 2019—followed by California, Oregon, and Texas—that we've started to uncover the scale and scope of this industry.
https://privacyrights.org/data-brokers
