Photograph of the Oklahoma National Guard during the Tulsa Race Massacre

On May 31 and June 1, 1921, in Tulsa, Oklahoma, mobs of white residents brutally attacked the African American community of Greenwood, colloquially known as "Black Wall Street," in the deadliest racial massacre in U.S. history. Amidst the violence, both white rioters and the Oklahoma National Guard rounded up black residents of Greenwood and forced them to detention centers. More than 6,000 African Americans were interned at the Convention Hall, the Tulsa County Fairgrounds, and the baseball stadium McNulty Park. Some were held for as long as eight days.