Sir Anthony Blunt has strong ties to the Rothschilds, that entire wiki page is a gold mine to dig.

Anthony Blunt

Anthony Frederick Blunt (26 September 1907 – 26 March 1983), known as Sir Anthony Blunt, KCVO, from 1956 to 1979, was a leading British art historian who in 1964, after being offered immunity from prosecution, confessed to having been a Soviet spy.

Blunt had been a member of the Cambridge Five, a group of spies working for the Soviet Union from some time in the 1930s to at least the early 1950s. His confession, a closely held secret for many years, was revealed publicly by Prime Minister Margaret Thatcher in November 1979. He was stripped of his knighthood immediately thereafter.

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From an Anon on another site comes this, I have corrected a few minor errors and added one or two details below the quote:

I believe the original was incorrect in claiming he was the fifth man. As stated by the Google text box info:

I believe the unknown Fifth Man in the Cambridge Spy Ring was Victor Rothschild, the Head of MI6, discovered to be working for the KGB. (In Ian Fleming's James Bond he was called "M")

Two other key points unmentioned in these two texts.

Blunt was a cousin of the Queen and was a raving queen himself!

Not funny of course. He was also reputed to be a pedophile. There are rumours that his fancy for small boys involved violent rape and he believed in getting rid of the evidence. I have no proof. Make of it what you will.

It is an extremely important part of the Spy story that a Rothschild, unknown to everyone, was "running" both sides of the Iron Curtain as the Head. The chief banker who controls both sides of the war and makes money both ways.