Sonya’s Red Heart, Part Two: The Secrets of Sonya | GRU
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This is True Spies, the podcast that takes you deep inside the greatest secret missions of all time. Week by week, you'll hear the true stories behind the operations that have shaped the world we live in. True Spies. You'll meet the people who live life undercover. What do they know?

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This is True Spies. Within months of her arrival in England, the war turned, Hitler attacked Russia and Russia became an ally on whom Britain was ordered not to spy and ordered by Winston Churchill not to spy. What Sonia did was manipulate this international situation to her advantage.

I'm Sofia DiMartino, and this is True Spies from Spyscape Studios. Sonia's Red Heart, Part 2. The Secrets of Sonia. In the first part of this story, you met one of the most notorious spies of the 20th century. A woman born with the name Ursula Kaczynski, but one who would find her true identity when she was gifted another. Agent Sonia.

In her native Germany, you saw Ursula discover the communist ideology that was to become her life's purpose and receive her first assignments as a newly minted Soviet spy. For the first part of her prolific career, Agent Sonja's theatre of espionage was the Far East. First in Shanghai, then in Manchuria.

She made herself an indispensable asset to Stalin in a time of violent political turbulence. But there's an aspect of Sonia's story that we haven't looked at head on, at least not yet. It's time to meet the other Kaczynskis. The Kaczynski family play an important role, particularly Sonia's brother Jurgen.

In September 1935, the Reich Citizenship Law was passed, prohibiting Jews from claiming or keeping hold of German citizenship. Sonja's family was Jewish. Most of them had already fled to Britain and were living together in a small flat in Hampstead, North London. Now, with the writing well and truly on the wall, her brother Jürgen followed suit.

Jürgen and Sonja's father, René Kuczynski, was an extremely famous social economist. For a UK government increasingly uneasy with the situation in neighbouring Europe, such an expert could prove useful.

They could give an extremely important view of what was happening, in this case the German economy. So the family was important, they had skills. From the moment the Kaczynskys set foot on British soil, MI5 took an interest in this prominent family. Their MI5 files, long since declassified, encompass hundreds of entries.

They knew that Jürgen and his father had communist sympathies, but they also knew that they were opponents of Hitler and clever, gifted and knowledgeable opponents of Hitler. And so the intelligence services tolerated the Kaczynski's politics.

While in Britain, Jürgen contributed to the magazine Labour Monthly, an organ of the Moscow-oriented British Communist Party. He became a natural leader for the German communists who had sought refuge in the UK from Nazism. And the Lawn Road flats in Hampstead became second home to a star cast of well-connected German émigrés.

a who's who of the left-leaning refugee intelligentsia, which is probably how one Klaus Fuchs became involved.

a very brilliant physicist who would also have known Jürgen Kaczynski and probably René Robert Kaczynski. Klaus Fuchs, whose story we told in the Klaus Fuchs Effect on True Spies, was at that point involved in one of the most impactful science experiments of all time, a top-secret research project exploring the possibility of an atomic bomb.

I suspect the moment Klaus Fuchs realized that his skills in physics were to be exploited by the United Kingdom to build an atomic weapon, he told Sonia, Sonia told Moscow, and they said, "We want to know about this."

But we're getting ahead of ourselves. That all takes place in 1941. We last saw Agent Sonia in Manchuria in December of '34, with the net finally beginning to tighten around her. Fearing her imminent capture, the Soviets hastily recalled their prized agent to Moscow. Understanding what happened next is central to Antony's account of her life.

First came three years in Poland, assisting underground communists, and where she gave birth to a second child, Janina, conceived through an affair with her colleague in Manchuria, Johan Patra. But it was Sonia's subsequent posting to Geneva in Switzerland that would throw the red spy into uncharted territory.

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Sonia managed to get to Switzerland and British secret intelligence activity, as we know from file KV641, centered on Geneva. When Sonia arrived in Switzerland on September 24th of 1938, with fresh blank pages stitched into her passport, two small children and a nanny in tow, she could scarcely have seemed less assuming.

Yet Geneva was a house of mirrors, a hotbed of international espionage where you'd be foolish to trust anyone. Apparently, on Moscow's orders, she recruited two English communist agents: Alexander Alan Foote and veteran of the international brigades in Spain, Len Burton, both of whom she dispatched to Munich to gather crucial intelligence there.

But most importantly of all, it was in Switzerland, perhaps, that Sonia first truly began to recognise the danger of her situation. It's important to realise she came from a prominent Jewish communist background. Either of those things, to be Jewish or to be a communist, spelt doomed.

for Sonia if the Gestapo were to get their hands on her. A fate that lurked behind every corner. By March of 1939, Prague was occupied, Austria annexed, and Heinrich Himmler's Gestapo spy hunters prowled the streets of Geneva, weeding out enemies of the Reich. Not only this, but Sonia's passport was due to expire.

So Sonia was in Switzerland, but her position there was extremely precarious. And this is where, in Anthony's opinion, the story of Sonia's life diverges from that which has previously been put on paper. Because Sonia was not the only spymaster in town.

The MI6 officer, chief officer in Switzerland was a man who in civilian life had been a professor called Victor Farrell. Victor Farrell is scarcely mentioned in the existing literature on Sonja. But it is this Victor Farrell that Antony believes changed the course of Sonja's life once again.

He knew that MI5 had recruited Nazi spies, Germans but not only Germans, working as agents for Hitler's intelligence service and turned them into double agents, the so-called double cross system.

When Victor Farrell became aware of Sonia's presence in Switzerland, he formed the view, this is my argument,

that Sonia could be turned into a double agent working for Britain, using the same logic that had turned Nazi spies into double agents for Britain. Sonia and Rudolf's marriage was by now over, and she and one of her British recruits, Len Burton, hastily wed.

By Sonia's account, it was a simple marriage of convenience. She needed a British passport to get herself and her children out of Geneva before the net closed in for good. But Anthony believes he can see the shadow of Victor Farrell lurking above the whole arrangement.

So Victor Farrell said, look, I've got a proposition for you. The Swiss police could hand you over at any moment to the Gestapo and you are vulnerable two times over. You're a noted communist and you're Jewish.

We'll get you a British passport. I have an agent here in Geneva who is English called Len Burton and a long-standing communist. He's been doing all sorts of great things as a double agent for MI6. Marry him. That'll give you a British passport and we will then get you to Britain. And the quid pro quo is, we know you're a GRU communications officer. Once you're in Britain, just tell us

who there is in Britain who is also working for Soviet intelligence. And that was the deal. Meanwhile, back in the UK, the Kuchinskys had been coming under increasing suspicion.

The Free League of Culture, with which they were involved, was accused of spreading anti-war sentiment. And Jürgen was even interned at a camp for enemy aliens in Devon in September 1939, when Britain entered the war.

Indeed, every contact Sonia had in the UK had fallen under the suspicion of the UK intelligence services, including her new husband Len Burton, whose presence in Germany in September of '39 had raised a red flag. Yet Sonia, or perhaps I should say Ursula Kaczynski Burton, was deemed safe to travel.

She got a British passport, managed to get, thanks to MI6, on a steamer coming to Britain and arrived in Liverpool on the 6th of February 1941.

She would move to several modest properties in neighbouring Oxfordshire villages during her time in the UK. First of all moved to number 78 Woodstock Road, then 97 Kingston Road, it's also in leafy North Oxford, and then she moved to Summertown, even more leafy North Oxford in March 1941, and later that month went to Glympton, a little town north of Oxford.

All were close to the UK's Atomic Research Centre at Harwell and to Blenheim Palace, where a large part of the British intelligence service had been relocated at the start of the war. In other words, she was well situated to serve her masters.

Those in the Soviet Union, desperate to keep astride with British developments, yes, but also those in MI6, who wanted to weed out Soviet spies in their midst. It's not hard to see how Sonia could have acted as a double agent. But shortly after Sonia's arrival, something happened that would have shattered Victor Farrell's entire plan to pieces.

Within months of her arrival in England, the war turned, Hitler attacked Russia, and Russia became an ally on whom Britain was ordered not to spy, and ordered by Winston Churchill not to spy. And what Sonia did was manipulate this international situation to her best advantage.

If the two nations were fighting towards the same cause, then there could be no need for an agent, let alone a double agent like Sonia, to operate. So from having a double agent taken to Britain, an extremely refined MI6 plot, Sonia was more or less made redundant. Talk about timing. That gave Sonia this chance.

amazing opportunity, providing she was sufficiently skilled to cover up what she was actually doing. Because it was one thing not to do anything, to be redundant, to be a German refugee floating around in Oxford and London refugee circles in Hampstead. It was quite another, actually, to continue to spy for Stalin from the safety of the United Kingdom.

In this matter, Sonia perhaps displayed more foresight than her British hosts. For them, hostilities had been suspended, new allegiances formed. For Sonia, there could only ever be one allegiance.

This is a woman who had abandoned her infant for six months to go to spy school. A woman who had seen former comrades and friends executed in the great purges of the mid-1930s and remained loyal to the dictator who'd ordered them. This is a woman who had cast herself as the protagonist in a global fantasy of romance and danger. Was she about to trade that all in for a quiet life in the country?

The Soviet Union continued to spy on Britain and the United States of America even though Britain and the United States of America ceased to spy on the Soviet Union. And that was Sonia's huge advantage. By this time, war in Europe was raging on two fronts. And the secret race to build a potential kingmaker in the form of a nuclear weapon was in full force.

Universities around the country offered their labs and their most prized scientists to the so-called "tube alloys" project. Against this backdrop, Sonja thrived. Enter, once again, Klaus Fuchs, the quiet mathematical physicist and German émigré who'd been recruited to work as an agent for the Soviets in 1941, probably via Sonja's family.

As part of the Tube Alloys project, he'd been working at the University of Birmingham, at the center of the most secretive British science project ever to be conducted for military purposes. Something that would prove to be world-changing. And Sonia was appointed his courier.

There were pages and pages of formulae that were needed in order to produce the sort of explosion that an atomic bomb needed to produce. So there was documentary evidence. And that documentary evidence would certainly have been handed over. According to Sonia's memoir, sometimes she would cycle to Banbury, meet Fuchs, and they would take a walk around a nearby park, pretending to be a loving couple.

Other times they would use a dead drop. But just handing it over was just one part of it. In a way, the more important part was handing it over to the Russians so that they could replicate what Klaus Fuchs was doing and their own scientists could work out exactly how the Brits, through the Tube Ally project, were seeking, in effect, to break the atomic code.

Finding a way of transmitting so much data back to Moscow without arousing the suspicion of British intelligence services was one of Sonia's biggest challenges yet. There were many Nazi spies operating in the United Kingdom.

And something called the Radio Security Service employed lots of radio hams, radio amateurs, to scour the airwaves every evening to pick up signals that were then passed to the Radio Security Service, who tried to identify whether they could come from German agents.

A radio signal has no passport. Each intercepted transmission was worthy of investigation. So for Sonia, the huge risk was that MI5 would pick up one of her radio messages. They would assume that it could be a German agent operating in Oxford. What Sonia had to do

was continue to send messages to the Soviet Union, but not be discovered.

by people who were both technically adept at the discovery, because not least they wanted to get German spies, but also understood that she was a communist and that therefore she might be up to something. When Sonia wasn't meeting Klaus Fuchs, she would be baking scones for her neighbours or doting on her now three children. She and Len had baby Peter in 1943.

She knew very well from her days back in Shanghai the power she wielded by appearing to be nothing more than a mother and homemaker, albeit a slightly eccentric one.

Sonia's marriages and relationships, her vivaciousness, her charm, the electric sort of person that she was, the personality she had. I think Brits thought, "Hmm, that's sort of continental, it's sort of Weimar-esque." I think that's how they saw her. Yet all the while, she was betraying the most valuable secrets of the British nuclear project.

And I think she found an extremely ingenious way of doing that. What she did was let everybody know that she was a wireless operator. And how did she let everybody know she was a wireless operator? Well, by erecting wireless aerials everywhere she appeared to be living.

Sonja's radio was no secret. Her neighbors noticed the aerials. In fact, MI5, the radio security service and special branch even knew its precise location. And because they knew the precise location, they could quickly verify that she wasn't using it at all. They'd even come round to have a look.

What they didn't twig was that Sonia and her new husband, Len Burton, had hired a second house north of Summertown on the road to Kidlington at 134 Oxford Road, Kidlington. And that house, in my opinion, was the key house where Sonia's real radio equipment and functioning aerials were utilised by her.

It was this house that Anthony believes was used almost exclusively for the communication of Klaus Fuchs' material from October 1942 to December 1943, at the height of his contribution to the Tube Alloys project. And why was that not discovered? A simple matter of wireless radio traffic.

It was right next to, literally 200 metres, 300 metres, next to a wartime airport at Kidlington in Oxford. And for obvious reasons, there were radio signals going out and going in all the time at that airport, and it would be impossible for anybody to work out what was an RAF signal and what was a signal possibly used by the...

a Soviet communications officer. No wonder she was thought by many to be Stalin's favourite spy.

Eventually, Klaus Fuchs would be relocated to New York, where he was assigned a new courier. Then to the Manhattan Project at Los Alamos, deep in the New Mexican desert. There, the first successful US atomic bomb test took place, at a site codenamed Trinity, on July 16, 1945.

And it was in 1949, by which time Fuchs was back in the UK, that the Soviet Union carried out their own successful nuclear weapons test. The West watched on, stunned. By this time, the uneasy alliance of Britain, the US and the Soviet Union was well and truly over, and the Americans were working their way through a backlog of Soviet-related intelligence gathered during the war.

of what were thought to be Soviet wireless traffic going from the United States by shortwave radio to Moscow Centre and to other embassies. That was kept and recorded on magnetic tape

This was called the "Venona Material". And after 1945, Americans began to seek to decode the "Venona Material". Which pointed towards Klaus Fuchs being a major atomic breach. And if Klaus Fuchs had been compromised, Sonja's days were surely numbered too.

By this stage, Sonia was living in Great Roll-Ride, again to the north of Oxford, but in hilly territory. Perfect, it would seem, for transmitting signals.

But the code experts are desperately chipping away at messages that will expose the truth of what she's been doing. What's more, the Soviets are no longer considered allies, quite the opposite in fact. So any leeway Sonia had been granted as a German communist during the war wouldn't help her now.

MI5 officers allegedly, according to Sonja's report, came to speak to her to ask her questions if she had anything to do with Klaus Fuchs. She said no. Sonja was not arrested. Instead, she hastily made plans to return to her homeland. She gathered her belongings, tried to pacify her three children. Then went off to what was by now East Germany in 1950.

She's scarpered. Or did the security services allow Sonia to leave?

In my view, they didn't say, "Do you know Klaus Fuchs?" They said, "We know you know Klaus Fuchs. Get the hell out of this country before we're forced to arrest you." Because if she had been arrested, she would have disclosed that she in fact had been a British double agent recruited by MI6 in Geneva, betraying one of Britain's most important secrets to the Russians.

If you were the head of MI6 at that time, what would you have done? Get rid of her as quickly as possible. The day before Fuchs' explosive trial started, agent Sonja left England. In March 1950, after two decades away from the city of her birth, she turned up in Berlin, back where it had all started. And there she stayed.

Now, you may ask yourself why Dr. Anthony Gleeser's theory is any more plausible than the idea that there was a super mole at the top of MI5 working for the Soviets, or that Sonia had simply passed through the net because she wasn't vetted with enough rigor.

Well, there is one final piece of evidence that Anthony and his colleague Dr Percy found in file KV641, perhaps the most crucial yet. It was a letter to Len Burton sent on the 9th of March 1943, so two years after Sonia had been shipped into the United Kingdom thanks to MI6. Although it's rather short, it says an awful lot.

For Anthony, it was the missing piece of the puzzle.

What this indicates is a direct and personal relationship between Victor Farrell, the MI6 officer, and Len Burton, the communist double agent for MI6, who was set up to marry Sonia, and asking why Sonia was, in effect, so silent. And to me, that is the clue

One thing is beyond doubt. She lived and died for the success of Soviet communism. Sonia played a significant role in the government of communist East Germany right up to its collapse in 1989 when she was one of a small number of elite leaders who begged the East Germans not to give up communism and to stay as part of the communist world. She never expressed doubt or regret.

Not about those in Great Britain who had considered her a neighbour and even a friend. She had betrayed the ordinary people of the United Kingdom who had taken her in and offered her succour. Not about any of the lives she'd damaged during her quest. Sonia's heart would always remain red.

And if you think about it, it is that quality that you are after if you're recruiting an intelligence officer. I think in her heart, she was entirely steely and dedicated to the communist cause and would do anything in order to advance the communist cause. And it was that that made her so dangerous. I'm Sofia DiMartino.

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