During the months of civil-rights uprisings known as “the long, hot summer of 1967,” Gordon Parks of Life magazine, the only African-American among its staff photographers, went to Harlem to take some pictures. Instead of photographing protesters and riots, Parks chose to focus on a family, the Fontenelles. He followed them day in, day out, taking heartbreaking portraits of the 10-member family. “I got fed up with hearing all these people, even Negroes, ask, ‘Why are those people rioting?’” Parks said in 1968. “My personal project was to show them why.” The photographs are on display in this online exhibition. —E.C.