A leading case in First Amendment jurisprudence regarding protected forms of expression is Pickering v. Board of Education. This case involved a teacher whose job was terminated when he wrote to a local newspaper an editorial critical of the teacher’s employer. The Supreme Court held that the school had unconstitutionally restricted the First Amendment rights of the teacher to speak on issues of public importance. Based on Pickering and similar cases, teachers generally enjoy rights to freedom of expression, though there are some restrictions. Teachers may not materially disrupt the educational interest of the school district, nor may teachers undermine authority or adversely affect working relationships at the school.