This archival collection includes Subject Correspondence Files comprised of case files, letters, and other related publications and documents, including: Asian Immigration and Exclusion, 1898-1941; Mexican Immigration, 1906-1930; Ellis Island, 1900-1933; European Investigations, 1898-1936 and Prostitution and White Slavery, 1902-1933, and Suppression of Aliens, 1906-1930. Also includes oral histories of those who immigrated through, or worked at, Ellis Island during the peak of mass migration to the United States.