In this Dec. 12, 1974 file photo, white students, who walked out of Boston’s Hyde Park High School, stand along the curb and jeer school buses carrying blacks home from the school. The nonprofit Union of Minority Neighborhoods is hosting group exercises across Boston in 2013, where participants talk about how the city’s busing crisis impacted them in the 1970s. Organizers hope it will unite people to fight for better access to quality public schools for all students, even as another new Boston school assignment system starts. (AP Photo/Frank C. Curtin, File)