The Berlin File ((full)) -

Monitoring accounts: Thorough descriptions of suspicious activity, meetings, and exchanges between parties and organizations.

The archive is thought to have been assembled by a team of skilled intelligence agents, who labored incessantly to collect and assess the data. The documents were likely stored in a secure location, available only to cleared individuals. The Berlin File

Cryptic messages: Enciphered transmissions between operatives, often using complex codes and secret caches. The Berlin File

The Elements of The Berlin File