I do not know if Gordievsky was right about John Cairncross or not, and it may be that his account really has to do with this fairly well known matter involving the Battle of Kursk, but in general he was one who supported allegations made against many whom many in the US, Canada, and UK denied were spies (e.g. Alger Hiss, Harry Dexter White, Rosenbergs while denying the latter were significant at all, and numerous others).  Given that he didi have serious access to the relevant files and these other reports, his unequivocal denial that Pigou was a Soviet agent must be taken very seriously. 
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From: Societies for the History of Economics [[log in to unmask]] on behalf of Robert Leeson [[log in to unmask]]
Sent: Sunday, December 05, 2010 11:36 AM
To: [log in to unmask]
Subject: Re: [SHOE] Was Pigou a Bolshevik spy?

The book 'outing' Pigou and numerous others was serialized in the Guardian in early summer 1979: several people were outraged (I would like to see the Kaldor letter if possible).  In particular, lawyers for Sir Rupert Peirles wrote to the publishers of the book stating that "the late Sir Rupert" is both alive and suing: substantial damages were paid and a apology was read out in open court.

The origin of the story about Pigou appears to be a drunken wartime evening in Pigou's rooms in Cambridge with Wilfred Noyce, Terrell, a mysterious Scots/Canadian and Richard Holmes - who recounted the evening to Richard Deacon (Donald McCormick) in a 27 page hand written letter 36 years later.

The book was withdrawn after four days and pulped.  Hayek appeared to believe Deacon's account and interpreted the events as evidence of "The Suppression of Information" (the title of an essay he planned to write on Pigou and the "suppression" of the book).

Robert Leeson

----- Original Message -----
From: "John Barkley - rosserjb Rosser" <[log in to unmask]>
To: [log in to unmask]
Sent: Sunday, 5 December, 2010 5:58:23 AM
Subject: Re: [SHOE] Was Pigou a Bolshevik spy?

Blunt was the fourth man.  According to Gordievsky, the fifth man was John Cairncross, brother of economists Alec Cairncross.
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From: Societies for the History of Economics [[log in to unmask]] on behalf of Nicholas Theocarakis [[log in to unmask]]
Sent: Saturday, December 04, 2010 12:43 PM
To: [log in to unmask]
Subject: Re: [SHOE] Was Pigou a Bolshevik spy?

I remember about 30 years ago just before Tony Blunt was outed as the 5th man (Kim Philby etc.) that someone had suggested in the press that the fifth man was Pigou. This prompted Nicholas Kaldor to write an irate letter (to the Guardian I think) restoring Pigou's memory and arguing that because libel laws do not apply to the dead, this made Pigou the victim of any troglodyte.

Nicholas Theocarakis
Dept of Economics
University of Athens

On Fri, Dec 3, 2010 at 4:43 PM, Robert Leeson <[log in to unmask]<mailto:[log in to unmask]>> wrote:
I have located the 1905 coded diary that persuaded Hayek that Pigou was - for over 50 years - a Bolshevik spy.

Hayek was apparently told that the coded messages contained information about Pigou's involvement in gun-running.  Even if this de-coding is correct, the diary may still be a hoax.

Who can decipher codes?

There is a signature in the diary - it looks rather like the signature on Pigou's 1958 will rather than his signature as a young man. Hayek apparently confirmed that he recognized the signature as Pigou's writing.

I would be grateful to have access to other versions of Pigou's signature.

Robert Leeson
[log in to unmask]<mailto:[log in to unmask]>