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, d I l. DONALD DUART MA EAN, ET AL, ESPIONAGE-R REMYCABLES SEPTEMBER 1 AND 20 LAST, NFIDENTIALLY I IINFORMS THAT N - HMNTTED TO VABNNET TODAY FOR FINAL APPROVAL. PAPER WAS PREPARED BY BRITISH SECURITY SERVICE MI-5! AND CONTAINS SUMARY OF PETROV DISCLOSURE, BACK- GROUND INFORMATION RE SUBJECTS AND COMPLETE SMMARY OF ALL DEVELOPMENTS INSTANT CASE. BRIEFLY, IT MENTIONS THAT INFORMATION RE FURNISHING FOREIGN OFFICE DOCUMENTS TO RUSSIANS BY UNKNOWN SUBJECTS FIRST RECEIVED FROM CONFIDENTIAL SOURCE IN 1949; THAT INVESTIGATION NAS INSTITUTED AND IDENTITY OF SUBJECTS ESTABLISHED IN 1951; THAT THEY WERE BEING THEREAFTER PLACED UNDER OBSERVATION AND, PENDING COMPLETION OF OUTSTANDING INQUIRIES WITH PROSECUTION IN VIEW, IT WAS PLANNED TO'INTERVIEN THEN IN JUNE, 1951; THAT PASSPORTS NOT TAKEN UP AND PERMITTED TO CONTINUE WORKING IN FOREIGN OFFICE, IN ORDER NOT TO AROUSE THEIR SUSPICIONS RE OBSERVATION AND INVESTIGATION OR ELIMINATE THE ELEMENT OF SURPRISE NHEN FINALLY INTERVIENED. RE THEIR OISAPPEARANCE APRIL, 1951, PAPER STATES MACLEAN MAY HAVE BECOME AWARE OF ISURVEILLANCE AS HE LIVED IN ISOLATED AREA HARD TO COVER; THAT HE MAY HAVE BECOME SUSPICIOUS BECAUSE HE NO LONGER HAD ACCESS TO SECRET FOREIGN OFFICE DOCUMENTS, OR THAT THEY WERE ALERTED BY UNKNOWN SOURCE THAT THEY HERE UNDER INVESTIGATION. APART FROM THIS LATTER SUGGESTION, NO MENTION BEING MADE U7 PHILBY A ASPECTS TRIS CASE. INFORMATION RE SUBJECTS, IMMEDIATE RELATIVES AND THEIR CONNECTION WITH THIS CASE ALSO BEING MENTIONED. THIS NOT WHITE PAPER nnv CABIN T OR_IT MAY BE AALTERED. I T