Syracuse University has suspended four students in connection with a string of racist incidents, including a verbal assault on an African-American student. There have been at least 12 reports of racist graffiti and swastikas found on campus, and in one instance students at the university’s library received a white supremacist manifesto on their cellphones. On Thursday, Chancellor Kent Syverud signed a memorandum agreeing to 19 demands presented by student groups who organized a week-long sit-in protest of a campus building.