(Off) Heinz Felfe works behind the strictly guarded walls of the BND in Pullach. His specialty is the fight against the KGB. He quickly got to the top due to some successes in this field.

Felfe; excerpt from an interview of German TV station WDR in 1986)

Yes, I attracted attention by successful counter-espionage. The results: Above all, I uncovered mistakes being made in a number of cases, helped preventing mistakes�
(Off:)

Unknown in the authority: Heinz Felfe is also an agent of the KGB since his commencement of work. The Soviet secret service recruited him by the means of money and friendship � and used his dark secret.

Heinz Felfe was, as a number of colleagues, member of the SS.

(Volker Foertsch, BND staff since 1957)

I think he did not commence particular war crimes or human rights offences but he concealed  the fact that he was a part of it�

(Witalli Korotkow, KGB contact officer assigned to Felfe)

We should not mention blackmail here. All secret services used something like that, the Americans, the English or the French. In individual cases, only in individual cases we did it too.
(Off)

Whatever information comes across Heinz Felfe�s desk comes to Moscow on secret ways.

(Interview with Heinz Felfe continued)

(Reporter)

By which means was your knowledge transferred to the KGB?

(Felfe)

There are the old classical methods every secret service uses, by courier, by invisible ink in letters or by �Mikrate�, that is, smallest photographs which are reduced to dot size or can be hidden in a postcard. I did not have radio traffic, I only listened to radio traffic and by this means I got instructions.
(Foertsch)

Now he was the one responsible for KGB reconnaissance and he also gave lectures on it. And he had a standard lecture in which he said, the KGB is divided in this and that and has the following objectives and it also keeps in touch with its agents by means of � which I think it then was called � �A3-traffic�, that is radio messages with numbers announcements that could be decrypted with his corresponding sets of numbers�

(Here, a short insert of an original G08 recording!) �7379 67�
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He then played an A3 traffic of the KGB and � this was the particular A3 traffic directed to him!
So this was somehow quite bizarre�  

(Off) Heinz Felfe was uncovered in 1961. Thereby the KGB loses one of its most important sources.