Harry Thompson (spy)

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Harry Thomas Thompson (born 1908) was a former United States Navy yeoman who spied for Japan against the United States in 1934–35. He was the first American to be convicted of espionage since World War I.

Thompson had been a Maryland farm boy who served one cruise with the Navy; however in the summer of 1934 he was jobless, making him a good target for recruiting. His handler was an officer of the Imperial Japanese Navy, Lt. Cmdr. Toshio Miyazaki (少佐宮崎敏夫 Shōsa Miyazaki Toshio), who was an exchange student of English at Stanford University. Miyazaki recruited Thompson in San Pedro, California by offering to pay him $500 initially and an additional $200 monthly. He was persuaded to board U.S. Navy ships dressed in a yeoman's uniform, for the purpose of gathering information from the crews. Through this and other methods, he was able to sell engineering, gunnery, and tactical information about the Pacific Fleet that was mainly based in nearby San Diego at that time.^[1]

Unfortunately for Thompson, the Director of the Office of Naval Intelligence (ONI), Capt. William D. Puleston, took a personal interest in so-called language students like Miyazaki. His suspicions were borne out when Japanese coded radio messages were intercepted and deciphered.

In reviewing one intercepted message, the cryptanalyst Agnes Meyer Driscoll had marked a section containing the word To-mi-mu-ra (とみむら). Not knowing what it meant, Driscoll showed the message to a Japanese language expert. The expert initially explained that the word could reflect a Japanese name but Driscoll did not agree. The expert next pointed out that the element mura, meaning "town", also had the alternate pronunciation of "son". Thus when the element tomi was combined with "son" the word became Tomison, which is the Japanese way of pronouncing Thompson.^[2] The ONI had now a lead for a possible spy. This was bolstered by the fact that Thompson told his story to his roommate, a Texas youth named Willard James Turntine, who in turn told all to the ONI before he fled back to Texas. Thompson was put under surveillance and was subsequently put under arrest on March 1936.^[1]

When the FBI arrested Thompson, Miyazaki suddenly left for Japan. Thompson was tried on July 2, 1936, and was convicted under the Espionage Act of 1917. He was sentenced to 15 years in McNeil Island prison.^[2]