Donald Maclean and Guy Burgess Betrayed the Foreign Office Since 1930s

By Constance Bell ·

Kept in the Security Service’s personal files, the record of a high-flying diplomat’s betrayal shows how he and his American wife operated under multiple aliases for Moscow.

Every secret cable sent from the British embassy in Washington during the early 1940s was a potential gift to Joseph Stalin. The trust of the Allied command was sold for a price, leaving Western diplomats blind to the very agents they believed were their colleagues.

The scale of this blindness is captured in a series of files held by the UK National Archives. Specifically, the catalogue entry for file KV 2/4155 records the life and double-dealings of Donald Duart Maclean, a man whose professional ascent was matched only by his devotion to a foreign power. Maclean was not a low-level clerk or a disgruntled outsider; the record describes him as a "high flying employee of the Foreign Office."

"High flying employee"

That specific phrase—"high flying"—serves as a indictment of the establishment's vetting processes. Maclean didn't just occupy a seat in the civil service; he climbed the ladder of the British diplomatic corps while simultaneously serving as a conduit for Soviet intelligence. According to the catalogue entry for KV 2/4155, Maclean was assessed as having been a Soviet agent since the 1930s.

For two decades, the British state cultivated a man who was actively working to undermine it. The file's catalogue description lists a dizzying array of identities used to mask this activity. Maclean operated under the aliases Richard Curzon, Mark Frazer, Percy Maclean, and S Madzoevsky. This was not the behavior of a casual sympathizer, but of a professional intelligence asset deeply integrated into the machinery of the state.

This deception extended to his domestic life. The record includes Melinda Goodlett Maclean, an American and British national who shared her husband's clandestine burdens. The catalogue entry for KV 2/4155 and related files, such as KV 2/4152 and KV 2/4153, list her own aliases: Melinda Marling, Melinda Philby, and Natasha Frazer. The involvement of a spouse suggests a level of commitment to the cause that transcends simple political disagreement; it was a familial pact of treason.

The Washington Leakage

The betrayal reached its zenith in Washington, D.C. The file's catalogue entry records that by 1951, Donald Maclean was "identified as the source of a leakage from the Washington Embassy some years earlier."

While the catalogue entry does not specify the exact nature of the leaked documents, the timing is critical. A leak from the American Department of the Foreign Office during the war years would have provided Moscow with an unfiltered view of Anglo-American strategic planning. It allowed the Kremlin to anticipate Western moves and manipulate the diplomatic friction between the two allies.

That Maclean was only "identified" in 1951—years after the leak occurred—highlights a systemic failure. The Security Service (MI5) had created a specific category for such threats: the "Personal (PF Series) Files" under the heading "SOVIET INTELLIGENCE AGENTS AND SUSPECTED AGENTS." Despite having a dedicated system for tracking suspects, the state allowed Maclean to remain "high flying" until the evidence became undeniable.

May 1951

The end of Maclean's career in the Foreign Office came not with a trial, but with a disappearance. The catalogue entry for KV 2/4155 notes that "while under investigation he fled to the USSR." He did not go alone.

Related file KV 2/4107 focuses on Guy Francis De Moncy Burgess. Like Maclean, Burgess was assessed as having been a Soviet agent since the 1930s. The record states that Burgess "disappeared from London in May 1951 with Donald MACLEAN."

Burgess, too, had mastered the art of the mask, employing aliases such as Roger Styles and Jim Andreyevich Eliot. The simultaneous flight of two high-ranking establishment figures was a public humiliation for the British intelligence community. It signaled to the world that the heart of the British government had been compromised by an ideological contagion that had gone undetected for twenty years.

A Pattern of Files

The sheer volume of paperwork dedicated to Maclean suggests a frantic effort to piece together the damage. The National Archives catalogue shows a fragmentation of the record across multiple files—KV 2/4152, KV 2/4153, KV 2/4155, KV 2/4157, and KV 2/4159. Each entry repeats the same list of aliases and the same stark conclusion: the man the Foreign Office trusted was a Soviet asset.

This repetitive archiving is a testament to the confusion of the era. The state was left to sift through the remnants of a career spent in lies, trying to determine exactly how much of the empire's security had been signed away by a few men from the right universities with the right accents.

Guy Burgess, according to the catalogue entry for KV 2/4107, eventually "reappeared in Moscow," where he and Maclean spent the remainder of their lives as celebrated heroes of the Soviet state, far from the reach of the laws they had spent two decades betraying.