運用非暴力手段的抗議者 Protesters using nonviolent techniques

出處: "[African-Americans kneel on sidewalk outside City Hall in Birmingham, Alabama protesting racial segregation]." United Press International telephoto, 1963. Prints and Photographs Division of the Library of Congress. CREDIT: Lyon, Danny, photographer. "[Civil rights activists occupying a lunchroom counter during a sit-in]." [between 1962 and 1964]. Prints and Photographs Division of the Library of Congress.