"Voter registration." . . "Civil rights workers." . . "Mississippi." . . . . "Civil rights workers Mississippi." . . "African Americans Civil rights Mississippi." . . "Voter registration United States." . . "African Americans Civil rights." . . "Student Nonviolent Coordinating Committee (U.S.)" . . . . . "Papers of an executive director of the Southern Christian Leadership Conference, consisting of reports, newsletters, memoranda, clippings, a summary of incidents in the Mississippi Freedom Summer project, and other items dealing with voter registration, political organization, and legal and extra-legal reactions of southern segregationists, including frequent information on other civil rights organizations." . . . . . . . . . . . . "Southern Christian Leadership Conference." . . "United States." . .