This is why we have the First Amendment.
And..... here is a bit of info on the school district case:
Board of Education, Island Trees Union Free School District No. 26 v. Pico, 457 U.S. 853, 102 S.Ct. 2799, 73 L.Ed.2d 435 (1982)
In 1975, three school board members sought the removal of several books determined objectionable by a politically conservative organization. The following February, the board gave an "unofficial direction" that the books be removed from the school libraries, so that board members could read them. When the board action attracted press attention, the board described the books as "anti-American, anti-Christian, anti-Semitic, and just plain filthy." The nine books that were the subject of the lawsuit were Slaughterhouse-Five by Kurt Vonnegut, Jr.; The Naked Ape by Desmond Morris; Down These Mean Streets by Piri Thomas; Best Short Stories of Negro Writers edited by Langston Hughes; Go Ask Alice; Laughing Boy by Oliver LaFarge; Black Boy by Richard Wright; A Hero Ain't Nothin' But a Sandwich by Alice Childress; and Soul on Ice by Eldrige Cleaver.
The board appointed a review committee that recommended that five of the books be returned to the shelves, two be placed on restricted shelves, and two be removed from the library. The full board voted to remove all but one book.
After years of appeals, the U.S. Supreme Court upheld (5-4) the students' challenge to the board's action. The Court held that school boards do not have unrestricted authority to select library books and that the First Amendment is implicated when books are removed arbitrarily. Justice Brennan declared in the plurality opinion: "Local school boards may not remove books from school library shelves simply because they dislike the ideas contained in those books and seek by their removal to prescribe what shall be orthodox in politics, nationalism, religion, or other matters of opinion."