Saama Sane said that when he was a junior at Noble and Greenough School in Dedham, Massachusetts, a white student repeatedly called him the N-word as he sat at a table in the library. Sane said he responded by yelling insults back and ended up on the floor in a headlock, all while five white students, some of them laughing, stood by watching. He reported the incident, and the school, which enrolls just over 600 and charges tuition upward of $58,000 a year for boarding students, took disciplinary action against the student, he said.