As per one of the primary source documents, The FBI detained approximately 1200 Japanese foreigners around the country after the Japanese attack on Pearl Harbor . In a letter by J. Edgar Hoover, he can be seen referring to the Japanese as “aliens” . The military advisors believed that the relocation of Japanese people living in the United States was a necessity in order to avoid spying. Along with the Japanese, both the Germans and the Italians faced the same fate. During World War 2, thirty thousand Japanese Americans fought for the US forces and their freedom.