Covers the investigations made by the Immigration and Naturalization Service (INS) during the massive immigration wave of 1880-1930. The files cover Asian immigration, especially Japanese and Chinese migration, to California, Hawaii, and other states; Mexican immigration to the U.S. from 1906-1930, and European immigration. There are also extensive files on the INS’s regulation of prostitution and white slavery and on suppression of radical aliens. Provided by UT Southwestern and the University of Texas System Digital Libraries.