The files detailed the identities and operations of "illegals"—spies operating under deep cover without diplomatic immunity. Notable revelations included the uncovering of the Portland Spy Ring in the UK and the long-term activities of agents in the United States, Germany, and France.
To understand the context of the raw files, most readers turn to the official volumes co-authored by historian Christopher Andrew and Vasili Mitrokhin:
Here is a comprehensive breakdown of what the archive contains, its historical impact, and how to access these documents today. 📌 What is the Mitrokhin Archive?
This comprehensive guide explores the history of the archive, its contents, its global impact, and how you can access these documents legally and safely online. What is the Mitrokhin Archive?
The archive has enabled researchers to reevaluate existing narratives and challenge prevailing assumptions about the KGB and Soviet foreign policy. The documents have also provided new insights into the KGB's relationships with other Soviet entities, such as the Communist Party and the military.