Christina Krotkova worked in the Office of War Information (OWI) during World War II

World War II

World War II, or the Second World War , was a global conflict lasting from 1939 to 1945, involving most of the world's nations—including all of the great powers—eventually forming two opposing military alliances: the Allies and the Axis...

. The OWI handled war news for domestic use and overseas propaganda. Krotkova's chief target was Soviet defector Victor Kravchenko. Haynes and Klehr have identified Krotkova as allegedly using several code names with Soviet intelligence

NKVD

The People's Commissariat for Internal Affairs was the public and secret police organization of the Soviet Union that directly executed the rule of power of the Soviets, including political repression, during the era of Joseph Stalin....

 whom she transmitted information to. At least seven Venona project

Venona project

The VENONA project was a long-running secret collaboration of the United States and United Kingdom intelligence agencies involving cryptanalysis of messages sent by intelligence agencies of the Soviet Union, the majority during World War II...

transcripts refer to Kratkova. Haynes and Klehr identify Krotkova as code name "Zhanna", "Jeanne", "Ola", and "Ols". A difference of opinion arises on the latter two code names with Nigel West, who identifies "Ola" and "Ols" as being Sara Veksler, who also worked within OWI.

Sources

• John Earl Haynes and Harvey Klehr, Venona: Decoding Soviet Espionage in America (New Haven: Yale University Press, 1999)
• Nigel West, Venona: The Greatest Secret of the Cold War (London: HarperCollins, 1999)