Donald Maclean Used Four Aliases to Mask Soviet Service
By Harlan Pryce ·
Foreign Office elites deceived their colleagues for two decades, leaking Washington secrets before fleeing to Moscow; their names now sit in the Security Service’s PF Series files.
British diplomats and their spouses traded the security of the West for Soviet promises, leaving the Foreign Office blind to its own vulnerabilities for twenty years. This betrayal cost the alliance its trust and left a vacuum of intelligence in Washington that the Kremlin spent years exploiting.
There is a particular kind of failure that occurs when a government trusts a man because he speaks the right language and attended the right schools. The record of that failure is preserved in the catalogue of the UK National Archives, specifically within the Security Service’s Personal (PF Series) Files. These are the files the state keeps on "SOVIET INTELLIGENCE AGENTS AND SUSPECTED AGENTS."
Richard Curzon and Other Masks
Tradecraft is often a matter of subtraction—removing the true self to make room for a useful fiction. The file's catalogue entry for Donald Duart Maclean (KV 2/4142) records a man who lived in the spaces between identities. To the Foreign Office, he was a "high flying employee." To the Security Service, he was a collection of aliases: Richard Curzon, Mark Frazer, Percy Maclean, and S Madzoevsky.
This duality extended to his domestic life. The records list Melinda Goodlett Maclean, an American and British national, who operated under her own set of masks. The catalogue describes her as using the aliases Melinda Marling, Melinda Philby, and Natasha Frazer. When a spouse is integrated into the operational side of a betrayal, the deception is no longer just a professional lapse; it becomes a shared life built on a foundation of lies.
In the clandestine service, we recognize that aliases are not merely names; they are tools. They allow an asset to move through different social and political strata without triggering alarms. For Maclean, these names were the scaffolding that supported a career of systemic theft.
Leakage in Washington
Betrayal is rarely a single event; it is a leak that eventually becomes a flood. The catalogue entry for Maclean notes that by 1951, he was identified as the source of a "leakage from the Washington Embassy some years earlier."
While the catalogue does not specify the exact documents that walked out of the embassy, the human cost of such a leak is measured in the compromised positions of allies and the ruined careers of those who failed to spot the mole. Maclean had reached the rank of First Secretary and eventually became the head of the American Department in the Foreign Office. He was placed in the very heart of the Anglo-American relationship, the exact point where the most sensitive intelligence on the Cold War was exchanged.
That he was able to operate at this level for years suggests a catastrophic failure of vetting. The establishment did not look for treason in its own mirror; it assumed that men of Maclean's standing were inherently loyal to the Crown.
May 1951
The end of the game usually arrives with a sudden, frantic energy. The archival record (KV 2/4142) notes that Maclean fled to the USSR while he was under investigation. He did not go alone.
Related files (KV 2/4119 and KV 2/4117) record the flight of Guy Francis De Moncy Burgess. Burgess, who used the aliases Roger Styles and Jim Andreyevich Eliot, disappeared from London in May 1951. The two men, both assessed as having been Soviet agents since the 1930s, vanished together, reappearing later in Moscow.
For the Security Service, this was more than a loss of personnel; it was a public humiliation. Two men of the governing class had simply walked away from their lives and their country, taking a trove of secrets with them. The flight of Burgess and Maclean turned the suspected leakage in Washington from a departmental embarrassment into a geopolitical crisis.
Recruitment in the 1930s
The most damning detail in the catalogue entries is the timeline. Maclean and Burgess were both "assessed as having been a Soviet agent since the 1930s."
This means that for nearly two decades, the Soviet Union had an active, high-level presence within the British diplomatic corps. They didn't just recruit spies; they recruited the future leadership of the state. By the time the Security Service identified Maclean as the source of the Washington leaks, the damage had been compounding for twenty years.
When an agent is embedded that early and that deeply, they do not just steal secrets—they shape the environment. They know who is suspicious, who is naive, and where the gaps in the fence are. The record shows that Maclean was a "high flying" employee, a description that reflects not only his talent but his ability to mimic the expectations of his superiors while serving a foreign power.
Other related files exist in the National Archives, such as KV 2/4153, KV 2/4157, and KV 2/4147, which further track the identities and activities of Maclean and his associates. The catalogue entries leave one question lingering: how many others in the "high flying" circles of the Foreign Office were operating under masks similar to Richard Curzon?