Choose the sentence from this excerpt that best supports the claim that Klaus Fuchs should not have been allowed to work on the Manhattan Project.
Japan was an enemy during World War II; it had continued to fight after its ally, Germany, had surrendered in May. When the first bomb did not convince Japan to surrender, the United States dropped a second bomb three days later, on August 9. World War II ended shortly after that.
After the war, Fuchs returned to England. In late 1948, the Federal Bureau of Investigation (FBI) turned over some shocking evidence to British intelligence: Fuchs had been spying for the Soviet Union. The evidence specifically involved the passing of atomic bomb secrets.