Re: This could be as simple as adjusting credit scores ... but there's not a lot of money in that
The main 3 credit report companies in the US are required to provide requestors a copy of their credit report at least once per year. They are also required to remove any incorrect credit data on ones account upon request if they are unable to substantiate the information.
The bigger issue is with companies that are selling personal data besides credit information. There are no legal requirements for those companies to give somebody a copy of the data they hold about them and have no legal obligation to remove incorrect information.
If you are trying to find a job and are not getting any return calls or emails, maybe your data profile has you down as being arrested for auto theft, rape or robbery. Many companies will screen applicants by using a data aggregators' services to dig up any negative information.