Suburban spies who sold nuclear secrets to USSR

Published: 9 March 2026

The English Chronicle Desk

The English Chronicle Online — World

In the quiet London suburb of Ruislip, behind the lace curtains of a modest bungalow, two seemingly ordinary neighbours were running one of the most sophisticated Soviet spy operations of the Cold War. To the families living nearby, Peter and Helen Kroger were polite, book‑loving Americans who dealt in rare volumes and travelled frequently for their antiquarian business. In reality, they were veteran Soviet agents — Morris and Lona Cohen — and key members of the infamous Portland spy ring, a network that stole some of Britain’s most sensitive naval and nuclear secrets and passed them directly to Moscow.

Their story, long buried in classified files and Cold War secrecy, resurfaced recently through newly examined BBC archival reporting and MI5 documents. The tale is one of deception, betrayal, and extraordinary espionage ingenuity — a story that begins not in Moscow or Washington, but in a sleepy English street where no one imagined that a global intelligence war was unfolding next door.

The Portland spy ring was exposed in 1961, but its origins stretched back years earlier. At the centre of the operation were two insiders at the Admiralty Underwater Weapons Establishment in Portland, Dorset — a research facility responsible for some of the Royal Navy’s most sensitive underwater weapons systems. Every prototype, modification, and classified device was meticulously documented, photographed, and filed. For Soviet intelligence, these files were priceless. To obtain them, they needed someone on the inside.

That insider was Harry Houghton, a former Royal Navy officer who had been recruited by communist intelligence while stationed in Poland. When he returned to Britain, he secured a clerical job at the Portland facility and quietly resumed his espionage work. He soon began an affair with a colleague, Ethel “Bunty” Gee, who had access to even higher‑level classified material. Together, posing as a married couple, they travelled regularly to London to hand over stolen documents to their KGB handler.

Their activities might have continued undetected for years had it not been for Houghton’s wife, who became suspicious of his unexplained trips, sudden bursts of cash, and a tiny camera she found hidden under the stairs. She reported her concerns, but her warnings were dismissed as emotional outbursts — a decision that would later haunt British intelligence. The camera she discovered was a microdot device capable of shrinking entire pages of classified documents onto a speck of film the size of a full stop. These microdots could then be embedded into postcards or books and sent to Moscow without raising suspicion.

But the Portland ring was not just about insiders. It required expert couriers and communications specialists — and that is where the Krogers came in. Their unassuming bungalow concealed a fully equipped spy communications centre: a hidden radio transmitter, a photographic darkroom, microdot equipment, and a 74‑foot aerial running through the attic. Their antiquarian book business provided the perfect cover for frequent international travel, even behind the Iron Curtain. To their neighbours, they were friendly, eccentric Americans. To the KGB, they were among the most trusted agents in the West.

Their handler, known publicly as Gordon Lonsdale, was a charismatic Canadian businessman dealing in jukeboxes and vending machines. In truth, he was Konon Molody, a Russian‑born KGB officer whose luxurious lifestyle — complete with cars, a yacht, and a thriving business — masked his role as the central link between the Portland insiders and the Krogers’ suburban spy hub.

The ring might have continued indefinitely had it not been for a tip from one of the Cold War’s most important defectors: Polish intelligence officer Michał Goleniewski, codenamed “Sniper.” He informed Western intelligence that the Soviets had a highly placed British source inside naval research. Though vague, the warning was enough to prompt MI5 to begin surveillance at Portland. Suspicion quickly fell on Houghton, whose clandestine London trips with Gee were soon monitored. When they were seen handing a bag to Lonsdale, the net began to tighten.

MI5 followed Lonsdale to Ruislip, where he frequently visited the Krogers’ home. Over the next two months, officers conducted an elaborate surveillance operation from the house across the street, owned by the Search family. The Searches were instructed to behave normally while MI5 monitored the Krogers’ movements. Their teenage daughter, Gay Search, later recalled the surreal experience of living across from a Soviet spy headquarters without initially knowing it.

By early 1961, MI5 feared the ring might flee. On 7 January, Houghton, Gee, and Lonsdale were arrested in London after one of their meetings. A shopping bag they carried contained undeveloped film and classified Admiralty pamphlets, including details of HMS Dreadnought, Britain’s first nuclear submarine. That same day, police raided the Krogers’ bungalow. Helen Kroger attempted to destroy evidence by asking to stoke the boiler fire, but officers intercepted her handbag and found coded grid references for meeting points. A search of the house uncovered the hidden cellar, darkroom, radio transmitter, and thousands of dollars in cash.

The trial of the Portland spy ring began on 13 March 1961 and lasted two weeks. Lonsdale received 25 years in prison; the Krogers were sentenced to 20 years; Houghton and Gee received 15 years each. But the Cold War had its own rules. In 1966, Lonsdale was exchanged for British businessman Greville Wynne, who had been imprisoned in Moscow. He returned to the Soviet Union a hero and died in 1970. In 1969, the Krogers were swapped for British lecturer Gerald Brooke and flown to Poland before settling in Moscow, where they were awarded the Order of the Red Banner and later commemorated on Russian postage stamps.

Houghton and Gee served nine years before being released. Gee returned to Portland, where she faced taunts of “traitor” from neighbours. The couple married a year later, insisting they wanted only to live quietly.

The Portland spy ring remains one of the most significant espionage cases in British history — a reminder that some of the most dangerous Cold War battles were fought not in distant capitals, but in ordinary homes on ordinary streets. As the BBC’s Tom Mangold reported during the Krogers’ 1969 prisoner exchange, they were “sublimely happy” to return to the communist soil “for which they have lied and spied.” Their story endures as a chilling example of how deeply the Cold War infiltrated everyday life — and how easily the most explosive secrets could be hidden behind the façade of suburban normality.

Read More At>>