Arnold Deutsch Recruited Kim Philby in 1934 to Breach British Intelligence
By Vera Kessler ·
He spent decades deceiving his superiors in the SIS and MI5, a betrayal that remained unproven for twelve years after his colleagues fled to the Soviet Union.
British intelligence officers and Western allies were fed to the Soviet machine for decades by a man they trusted at the highest levels. The cost was measured in compromised networks and the professional ruin of those who tried to uncover the truth.
1934 and the Arnold Deutsch Recruitment
The file's catalogue entry for KV 2/4724 outlines a betrayal that began in the lecture halls of Cambridge. In the early 1930s, Harold Adrian Russell "Kim" Philby became a committed communist, a transformation that made him an ideal target for the Russian Intelligence Services (RIS). The record identifies Arnold Deutsch, an officer of the RIS, as the man who recruited Philby in 1934.
Philby was not an isolated asset but the first member of what would become the Cambridge Five, a ring of spies who penetrated the heart of the British establishment. By the time he joined the Secret Intelligence Service (SIS) in 1940, his allegiance was already fixed. He spent the next two decades climbing the ranks of the very organization he was tasked to undermine, eventually serving in a senior position in Washington between 1949 and 1951. For the RIS, Philby was a primary conduit for secrets during the fragile opening years of the Cold War.
Lizy Friedmann's Influence in Vienna
Philby’s path to treason was not a solitary journey. According to the catalogue description for file KV 2/4667, he met Lizy Friedmann in Vienna during the early 1930s. Friedmann, an Austrian and a committed communist herself, married Philby in 1933 before the couple moved to the United Kingdom in 1934.
While the primary file on Philby focuses on his movements within the SIS and MI5, the record regarding Friedmann suggests a deeper ideological root. The archival description notes it is "likely that Lizy encouraged Kim's commitment to communism," suggesting that the groundwork for his recruitment by Arnold Deutsch was laid in the political atmosphere of Vienna. The relationship between the two acted as a reinforcement loop, cementing a loyalty to Moscow that would survive decades of scrutiny and professional ascent in London and Washington.
Twelve Years of Suspicion
By the early 1950s, the circle began to close. The catalogue entry for KV 2/4724 records that the defection of fellow RIS agents Guy Burgess and Donald Maclean in 1951 placed Philby under "suspicion and intensive investigation by MI5."
For twelve years, Philby existed in a state of professional purgatory. He was watched by his own colleagues and subjected to rigorous vetting, yet he managed to survive. The record does not detail the specific failures of the MI5 investigation or how Philby successfully deflected the charges, only that the investigation was "intensive." This period represents one of the most significant intelligence failures of the era: a known suspect remained within the orbit of British intelligence long after the patterns of the Cambridge Five had become evident.
During these years, the gap between suspicion and proof allowed Philby to maintain his cover. While the public record describes him as the most successful of the Cambridge Five, the archival evidence suggests his success was partly due to the hesitation of the security services to move against a senior officer without absolute certainty.
A Partial Confession
The stalemate finally broke in 1963. The file's catalogue entry states that it was only then that "conclusive was obtained identifying him as a spy"—a phrase likely missing the word "evidence" due to archival shorthand or transcription error.
Faced with this certainty, Philby did not surrender to the British state for trial. Instead, he made a "partial confession," a tactical move that served as a bridge to his final exit. With the assistance of the RIS, he defected to the Soviet Union, escaping the legal consequences of his double life in the West.
Philby’s legacy remains scattered across multiple archives. While the UK National Archives hold files such as CAB 301/924 regarding his life in the USSR and CAB 301/942 regarding his film, the full scope of his transmissions continues to be studied through external sources, including the Venona messages held in the US National Archives.
The catalogue entry for KV 2/4724 concludes with the fact of his defection, but it leaves a void where the specifics of the evidence should be. The record tells us that the proof finally existed in 1963, but it does not say what that proof was.