This primary source comes from the Records of the Office of Government Reports.
National Archives Identifier:
516039Full Citation: 44-PA-2313; Warning from the FBI; 1941-1945; World War II Posters, 1942–1945; Records of the Office of Government Reports, Record Group 44; National Archives at College Park, College Park, MD. [Online Version, https://docsteach.org/documents/document/warning-from-the-fbi, May 9, 2024]