[AdmSmith]

I guess that you are thinking about Michal Goleniewski

http://www.cia.gov/csi/books/venona/preface.htm

[AdmSmith]

Lt. Col Michal Goleniewski the Deputy Chief of Polish Military Counter Intelligence until 1958. He also operated as a mole for the KGB in the Polish service.

Before his defection (to the CIA) he was in charge of the Polish military intelligence in East Berlin. After his defection in 1961 he revealed that George Blake was working for Soviets as well as several other leads.


http://www.videofact.com/english/agents20.htm