Philip Rosenbliett Fled the US to Serve Soviet Intelligence in 1936

By Constance Bell · August 19, 2026

A dentist vanished from the United States in 1936 to join the Soviet apparatus, leaving British intelligence to track his movements across London and the West.

An American dentist walked away from his practice and his country to serve a foreign power, leaving behind a trail of suspicion that spanned two continents. His departure in 1936 marked the beginning of a silence that British intelligence spent years trying to penetrate.

The file's catalogue entry records the case of Philip Rosenbliett, a man who operated under the alias "Rosenblieth." To the casual observer, he was a medical professional; to the Security Service in Britain, he was a subject of the "PF Series" files, specifically categorized under "Soviet Intelligence Agents and Suspected Agents." The catalogue entry notes that Rosenbliett was known to visit London, establishing a geographical bridge between his American origins and the Soviet interests he served.

Philip Rosenblieth

The use of an alias suggests a man who understood the necessity of the shadow. For a professional—especially one in a trusted field like dentistry—the ability to move through society unnoticed is a potent weapon. In the 1930s, the Soviet Union did not merely recruit soldiers or career diplomats; it sought the prestige and access of the professional class. By embedding agents in roles that commanded social trust, Moscow could cultivate networks and gather intelligence without triggering the alarms of counter-intelligence services.

This pattern of professional infiltration was not isolated to dentistry. The public record shows a similar trajectory for Lee Pressman, a labor attorney who became a central figure in the Congress of Industrial Organizations (CIO). Pressman, known to anti-communists as "Comrade Big," used his legal standing to navigate landmark collective bargaining deals with giants like General Motors and U.S. Steel before he was purged in 1948. Whether in a law office or a dental surgery, the objective was the same: the exploitation of American institutional trust to facilitate the goals of a totalitarian state.

Krivitsky's 1939 Warning

The mask for Rosenbliett began to slip not through a domestic blunder, but through the collapse of Soviet secrecy abroad. The catalogue entry for KV 2/3786 states that Rosenbliett was named by the Soviet defector Krivitsky in 1939.

Krivitsky was a high-ranking intelligence officer whose defection provided Western powers with a rare glimpse into the machinery of the NKVD. When he identified Rosenbliett as a Soviet agent in the USA, he was not merely providing a name; he was mapping a network of betrayal. By the time the warning reached British and American ears, the man they were looking for had already vanished. The timeline reveals a calculated exit: while the warning came in 1939, the damage had been done years earlier.

A Flight to Moscow

According to the catalogue entry, US authorities established that Rosenbliett left the USA for Russia in 1936. This three-year gap between his departure and Krivitsky's naming suggests that Rosenbliett was extracted or transitioned to the center of the empire long before his handlers were exposed.

This flight to Moscow is the definitive act of the agent. Unlike Pressman, who remained within the American labor movement to influence its direction from the inside, Rosenbliett chose the total embrace of the Soviet state. He traded his American citizenship and professional standing for a place in the Soviet intelligence apparatus, leaving the US government to piece together his activities from the fragments left behind.

There is a cold efficiency in the way the record presents this. There are no long narratives of ideology or political awakening—only a name, an alias, a defector's tip, and a date of departure. It is a ledger of loss. The Security Service continued to maintain his file, documenting his visits to London, perhaps searching for a pattern or a connection to other "suspected agents" who had similarly traded their lives for the service of the Kremlin.

The record leaves the final chapter of Rosenbliett's life blank. It does not state what role he assumed upon his arrival in Russia in 1936, nor does it record if he survived the purges that claimed so many of Stalin's foreign assets. The file simply marks him as an agent who left, and a name that Krivitsky could not forget.