CLOZE TEST-TEST 8

Three American spies were long known for having stolen U.S. atomic secrets between 1940 and 1948, sharing that information with the Soviets. Their actions fast-tracked the U.S.S.R’s development of nuclear weapons and set the ____ A ____ for the Cold War. But in fact, there was a fourth spy — code-name “Godsend” — who handed over atomic secrets to Soviet intelligence. This person’s identity was ____ B ____ from public view until now. His real name was Oscar Seborer, and he worked at the Los Alamos National Laboratory in New Mexico, home of the Manhattan Project where the first nuclear weapons were designed. For decades, Seborer’s name ____ C ____ in relative ____ D ____ , mentioned in a few dozen pages amid tens of thousands of secret documents compiled by the FBI. But once these files were declassified in 2011, they came to the attention of two historians, John Earl Haynes and Harvey Klehr. The researchers named Seborer as the fourth Los Alamos spy, based on the 2011 declassified FBI documents, as well as ____ E ____ records from a decades-long initiative called Operation SOLO. The operation, which ran from 1952 to 1980, centered on two brothers in the U.S. Communist Party who were FBI informants. To date, only the SOLO files up to 1956 have been released, and many open questions remain about Seborer’s activities as a spy and what happened to him after he later ____ F ____ to the U.S.S.R., the researchers wrote.