This primary source comes from the Collection DDE-WHCF: White House Central Files (Eisenhower Administration).
Full Citation: Night Letter, Brotherhood of Sleeping Car Porters, American Federation of Labor, to Attorney General Herbert Brownell Regarding Emmett Till Case; 9/28/1955; Collection DDE-WHCF: White House Central Files (Eisenhower Administration). [Online Version, https://www.docsteach.org/documents/document/night-letter-brotherhood-of-sleeping-car-porters-american-federation-of-labor-to-attorney-general-herbert-brownell-regarding-emmett-till-case, May 5, 2024]