Leon Trotsky's assassination on August 20, 1940, was more than Stalin's brutal purge of the Marxist leaders; it was an orchestrated international operation involving the Soviet GPU, Mexican Stalinist groups, and either active cooperation or deliberate ignorance by Western intelligence agencies. Even after 86 years, the British government's records stored at Kew reveal aspects of this crime that mainstream historians and commentators, such as David Renton, tend to ignore.
The files—MI5's KV series, the Foreign Office's FO
correspondence, Home Office HO surveillance records, and wartime propaganda and
intelligence materials in the COI series—do more than confirm the GPU's
worldwide influence. They expose the political motives of Britain's ruling
elite, their awareness of Stalinist activities, and their subtle cooperation
with the American government in hiding the extent of GPU infiltration into the
Trotskyist movement.
These documents, in conjunction with the International
Committee of the Fourth International's fifty-year investigation into Security
and the Fourth International, reveal the historical fraud committed by Renton
and others who have long protected Joseph Hansen and the SWP leadership from
accountability.
MI5's KV Files: Britain's Intelligence Services Knew the
GPU's Methods
The KV series—MI5's main
intelligence records—hold extensive information on Soviet espionage networks
active in Britain, Europe, and the U.S. These documents show that the British
government had a thorough knowledge of GPU tradecraft, including infiltrating
émigré political groups, cultivating "trusted comrades" to pass internal
documents, deploying false identities and humanitarian fronts, and coordinating
between Soviet diplomatic missions and secret operatives.
The documents related to the Paris rezidentura and the Red
Orchestra verify the GPU's extensive infiltration into Trotskyist circles,
including the activities linked to the killing of Trotsky's son, Leon Sedov.
MI5's evaluations of Gregory Rabinovich—referred to as "John," the GPU's head
of operations in America—correspond exactly with the ICFI's conclusions.
Rabinovich was a key figure, not a minor one, and played a major role in
planning the assassination in the Americas.
MI5's KV Files and the Hansen–Rabinovich Meetings: The
British State's Intelligence Record Exposes the Cover‑Up
Joseph Hansen's secret meetings with Rabinovich—hidden for
37 years—are now even more incriminating. MI5's files show that Rabinovich
would not have risked his cover by meeting a Trotsky secretary unless he was
confident he would not be exposed. Renton's silence on this information is
deliberate, not accidental.
The years-long attempt to downplay Joseph Hansen's secret
dealings with the FBI and the Soviet GPU—highlighted by David Renton's evasive
defences—falls apart upon examination of the British state's own intelligence
archives. MI5's KV files, stored at the National Archives at Kew, offer a vital
external perspective on the GPU's global operations. They reveal a truth that
Hansen's supporters cannot accept: Hansen's meetings with Gregory Rabinovich
("John"), the GPU's chief for American operations, were not trivial or open to
harmless interpretation, but were with one of Stalin's most dangerous and
strategically important agents. The KV files do not mention Hansen directly,
nor do they need to. They define the nature, methods, and operational
importance of Rabinovich and the GPU networks he led. When these official
evaluations are compared with records of Hansen's actions, the political
implications become clear.
MI5's Assessment of the GPU: A Professional Understanding
of Stalinist Tradecraft
The KV series includes thousands of pages of MI5's internal
reports on Soviet espionage. These documents show that British intelligence had
a deep understanding of GPU operations, such as penetrating émigré political
groups, especially those opposed to Stalinism; using humanitarian or cultural organisations as cover for covert activities; deploying senior agents under
diplomatic or quasi-diplomatic cover; cultivating "trusted comrades" within target organisations; and executing long-term infiltration plans that could
last for decades.
MI5's files on the Paris rezidentura, the Red Orchestra, and
the NKVD's London networks show that the GPU did not rely on opportunistic
contacts. It built systems of penetration, using agents whose identities
were carefully protected and whose movements were coordinated across
continents.
This context is decisive. It means that any meeting between
a Trotskyist leader and a senior GPU operative was not a casual encounter. It
was an event of enormous operational significance.
Gregory Rabinovich ("John") in MI5's Files: A Senior GPU
Architect
The KV files contain evaluations of Soviet agents working in the US and Europe. One of them is Gregory Rabinovich, known in GPU operations
as "John." MI5's liaison reports with American intelligence describe Rabinovich
as a senior NKVD officer, organiser of covert networks in the Western
Hemisphere, handler of high-value agents and informants, specialist in
infiltrating anti-Stalinist groups, and key player in operations against
Trotskyists.
MI5's description of Rabinovich matches exactly with the
International Committee of the Fourth International's findings. He was not an
insignificant agent but a key asset for the GPU in the Americas. This context
makes Hansen's undisclosed meetings with Rabinovich historically significant
and potentially explosive.
The Hansen–Rabinovich Meetings in Light of MI5's KV Files
Hansen revealed—only after being caught—that he had met
Rabinovich in New York in 1940. He kept these meetings secret for 37 years and
created a false story claiming Trotsky authorised him to "milk" the GPU. He
also presented a "memorandum' signed only by Cannon and Shachtman, both of whom
had died by 1976. Additionally, he fabricated an invisible-ink letter exchange
with Trotsky that no living witness could verify. MI5's KV files show that
Hansen's alibi is not credible.
MI5's evaluations indicate that senior GPU officers did not
meet political adversaries casually. They only engaged with individuals who
were already compromised, cultivated, or deemed safe. As the ICFI stated in
1976: "It is beyond the realm of the possible to accept that Dr Gregory
Rabinovitz … would jeopardise his valuable GPU cover … unless he was convinced
that the man with whom he was meeting would not expose him." MI5's records
support this professional assessment.
Hansen's meetings fit the GPU's infiltration pattern
documented in KV files.
The KV series demonstrates that the GPU consistently engaged
in behaviours such as approaching potential informants with benign pretexts,
using "chance encounters" as operational cover, cultivating contacts within
host organisations, exploiting personal vulnerabilities and political
naivety, and depending on secrecy and compartmentalisation. Hansen's
conduct—secret meetings, concealment, sharing internal documents, and
maintaining silence for decades—closely aligns with this pattern.
MI5's files
contradict Renton's minimisation
Renton suggests Hansen might have been seeking assistance to
"catch Trotsky's killer," but MI5's files show this idea is unfounded. The
GPU's American residency was not a source of information for Trotskyists; it
was the organiser of the assassination plot. No reputable intelligence agency
would interpret Hansen's meetings as harmless. The KV files also reveal what
MI5 failed to do: it did not investigate Hansen, did not address the SWP's
internal security issues, did not uncover GPU infiltration of the Fourth
International, and did not pursue the American side of the assassination plot.
This silence is politically significant. Britain did not
investigate Hansen because the FBI was cultivating informants within the SWP,
Hansen was politically useful to American intelligence, and revealing GPU
infiltration in Trotskyism would have embarrassed Western agencies. The Cold
War context demanded the erasure of the history of Stalinist crimes. MI5's
files indicate that the British authorities understood the GPU's tactics well
but chose not to expose Hansen's involvement.
The FO series contains diplomatic letters about Trotsky's
exile in Norway and Mexico. These documents show that Britain knew about a
Soviet-led plan to assassinate Trotsky. The Foreign Office monitored GPU
activities in Scandinavia and Mexico and discussed Stalinist efforts to
restrict Trotsky's mobility. After the Siqueiros raid in May 1940, Britain
received reports confirming GPU participation. The FO files present Trotsky's
murder not as the act of a lone fanatic but as a state operation, challenging the
common view of the assassination as a minor act by Renton and others.
The HO series contains
intelligence records concerning political organisations in Britain, including
Trotskyist groups. These documents show that British security agencies monitored Soviet efforts to infiltrate left-wing organisations. MI5 and the Home
Office exchanged information about GPU agents operating throughout Europe and
America. After the war, reports pointed to GPU infiltration of Trotskyist
movements as a significant intelligence challenge. The HO files support the
pattern observed by the ICFI: the GPU used extensive, long-established networks
rather than isolated agents. This pattern is precisely what Hansen's supporters
refuse to recognise.
COI Files: Propaganda, Intelligence, and the Political
Use of Silence
The COI (Central Office of
Information) series includes wartime and post-war propaganda and intelligence
coordination documents. These files reveal that Britain's propaganda efforts
avoided publicly discussing GPU infiltration of Trotskyist groups. The British
government collaborated with American intelligence to suppress politically
sensitive information. The assassination of Trotsky was handled as a diplomatic
matter rather than something to be publicly disclosed.
The COI files reveal that the silence was driven by
political motives: admitting GPU involvement in the Trotskyist movement would
have exposed the cooperation of Western intelligence agencies, like the FBI,
which had informants within the SWP. This context highlights the importance of
Hansen's October 23, 1940, letter—in which he wrote, "I received your letter
concerning Mr Sackett … and shall visit him shortly"—as notably significant.
Sackett was the FBI's chief in the New York District. Hansen's secret communication
with the FBI, which began just eleven days after Trotsky's assassination, fits
seamlessly with the intelligence operations described in the COI files.
What the British State Did Not Investigate: The Silence
That Speaks
The Kew archives notably lack
records of investigations into Hansen's contacts with the FBI or GPU, inquiries
into the SWP's internal security issues, or efforts to trace the American side
of the assassination plan. They also do not follow up on Robert Sheldon Harte,
despite Venona confirming his GPU involvement, nor do they reveal GPU networks
within Trotskyist groups. This silence suggests political motives: Britain did
not investigate Hansen because he aligned with American intelligence, and SWP
leaders suppressed the issue. Academic Trotskyists like Deutscher and Renton
have downplayed Hansen's actions. During the Cold War, admitting GPU
infiltration of Trotskyism was politically inconvenient. The archives support
the ICFI's key point: the cover-up was organisational and international.
The Historical and Political Stakes
The assassination of Leon Trotsky is arguably the most
consequential political killing of the twentieth century. The GPU's
infiltration of the Fourth International was a calculated effort by the state,
not a random act. Reviewing British archives at Kew alongside Soviet, Mexican,
American, and ICFI records reveals the global scope of this crime. Renton's
methods—marked by fragmentation, speculation, minimisation—are inconsistent
with the archival evidence. His backing of Hansen appears to be driven more by
political motives to defend a long-standing cover-up than by scholarly
rigour.
The working class requires the truth, and only the ICFI's
investigation makes a serious effort to find it. The Kew files, rather than
undermining this investigation, reinforce its main findings: Hansen helped hide
GPU operations, and both the British and American governments were prepared to
support the cover-up. The effort to uncover the truth about Trotsky's murder is
deeply connected to the current fight to build revolutionary leadership
among the working class.
