The power of words is incalculable. While researching immigration at Dartmouth, Melissa Padilla ’17 kept encountering the term “Illegal Aliens” as a library subject heading. Subject headings are created by the Library of Congress as categorical descriptions and are essential to how libraries collect, organize and disseminate books and other materials. This controlled vocabulary determines how library users find information across the US and impacts how people think, write and communicate. Committed to promoting the rights and dignity of undocumented peoples, Melissa, Oscar Ruben Cornejo Casares ’17 and other student activists petitioned Baker-Berry Library to change its terminology. When that failed, they went to the source. The Library of Congress considered their petition … and then Congress got involved. From one library to a national conversation, Change the Subject is their story.