Citing private individuals without their authorization?
Because these private individuals do not sound like they are publishing their work (in which course your questions about citation would make more sense), and you mentioned interviews with these individuals in a comment, your situation sounds more like it falls under the category of Human subject research which has all sorts of rules and regulations. Assuming you are at some sort of university, your institution probably has a Institutional Review Board that governs this type of research and includes guidelines for obtaining informed consent, etc.

In short, you cannot do research on human subjects without their consent, and this consent typically needs to be granted before the study begins. Human subjects research includes interviews, etc, you don't need to be doing medical experiments to be doing human subjects research.

If you are truly using only the publicly available resource I would still recommend trying to get permission to use the resource (and if you are reproducing any portion of the resource, permission may be mandatory), but at most all you can do is cite that resource and attribute it to the organization that has made it public, you can't attach your personal knowledge of the individuals involved.