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| Acronym: FBI | Federal Bureau of Investigation | '' (New York: Alfred A. Knopf, 1978), ISBN 0-394-49546-2, p. 346 On November 7, 1945, defecting Soviet spy Elizabeth Bentley told investigators of the Federal Bureau of Investigation (FBI) that in late 1942 or early 1943 she learned from Soviet spies Nathan Gregory Silvermaster and Ludwig Ullmann that one source of the government documents they were photographing and passing on |