Files with information obtained from spying on people

dossier

a set of papers containing information about a person, often a criminal, or on any subject:

Cambridge online

Ex

The secret service probably has a dossier on all of us.

Confidential information might be redacted on an official report to protect the identity of the informer.

Confidential Informants are also called CI in the USA.

A confidential informant (CI)1 is defined as an individual requiring anonymity who provides useful information, directed assistance, or both, that enhances criminal investigations and furthers the mission of the agency, usually in exchange for financial or other consideration. Individuals who serve as witnesses or citizens who provide information regarding criminal activity are generally not considered CIs. This distinction is based in part on the fact that CI arrangements involve the development of a relationship between the individual and the agency that focuses on the trading of information for some form of payment, to include prosecutorial consideration.Although CIs can provide investigators with specific information that is not available from other sources, it must be remembered that CIs are often criminals.

So maybe CI Files?

Perhaps “surveillance files”?

https://en.wikipedia.org/wiki/Surveillance