If you need help finding digital primary sources set up an appointment with Erica Bruchko to discuss your options. You can see her calendar and book a time to chat virtually here: https://libraries.emory.edu/contact/staff-directory/bruchko-erica.html.
The Library has a number of databases that contain primary source documenting the history of racial violence in America. Here's a list to get you started. It is strongly recommended, however, that you set up an appointment with your subject librarian, Erica Bruchko, for help navigating these databases and to identify additional collections.
African American Studies
Native American Studies
Asian American Studies
The Stuart A. Rose Manuscript, Archives, and Rare Book Library holds a number of important collections documenting racial violence in the United States. A number of collections related to African American History and Culture also chronicle the racial violence against African Americans. For an overview of these and other collections at Rose visit the Rose Library Literature Page.