Answer:
This was a 1988 Supreme Court case that held that student newpapers produced within the curriculum of a school (such as a journalism or writing class that is sponsored by the school) were not entitled to the same level of First Amendment protection as those of more general circulation.
The United States Supreme Court decision reversed that of a lower court which had limited the school's right of control over the content of the school-sponsored paper. The citation for the Supreme Court decision is 484 U.S. 260.