Historians Find Another Spy in the U.S. Atomic Bomb Project

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How Moscow managed to make such quick progress has long fascinated scientists, federal agents and historians. The work of three spies eventually came to light. Now atomic sleuths have found a fourth. Oscar Seborer, like the other spies, worked at wartime Los Alamos

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Mr. Seborer was born in New York City in 1921, the youngest child of Jewish immigrants from Poland, according to the study by Mr. Klehr and Mr. Haynes and a C.I.A. document they cited. He attended City College of New York, studied electrical engineering and worked at Los Alamos from 1944 to 1946.

In July 1945, the study reported, he was “part of a unit monitoring seismological effects” of the first detonation of the atomic device. His Soviet code name was Godsend, and he came to Los Alamos from a family of spies.

In 1951, Mr. Seborer fled the United States with his older brother Stuart, as well as his brother’s wife and mother-in-law, and defected to the Soviet Union, where, in 1964, he received the Order of the Red Star, a prestigious military award. He died in Moscow in April 2015 under the assumed surname Smith.

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