France, Feb. 15 -- The centre-right French l'Express magazine this week disclosed that its former director, Philippe Grumbach, served as a KGB agent from 1946 to 1981. But he may not have been the only one.

Revelations published by French weekly L'Express show that one of its founders and former editor, Philippe Grumbach, who died in 2003, worked for the Soviet spy agency for 35 years.

L'Express based its information on documents found in the archives of Russian defector Vasili Mitrokhin, which are housed at the University of Cambridge.

Mitrokhin was a disillusioned senior archivist in the KGB's foreign intelligence archive who smuggled thousands of files out of Russia, which were later compiled in the book "The Mitrokhin Archive: The ...