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In page Susan Williams (historian):

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In Spies in the Congo: America's Atomic Mission in World War II she tells an intricate tale regarding the formation of special unit of the US Office of Strategic Services (OSS), a forerunner of the CIA, to purchase and secretly extract all the uranium from Shinkolobwe in Katanga Province, Belgian Congo. The purpose of this was to obtain the radioactive material and keep it out of the hands of the Axis powers. The uranium was used in the bombing of Hiroshima and Nagasaki.[citation needed]