The issue of school speech or curricular speech as it relates to the First Amendment to the United States Constitution has been the center of controversy and litigation since the mid-20th century. The First Amendment's guarantee of freedom of speech applies to students in the public schools. In the landmark decision Tinker v. Des Moines Independent Community School District, the U.S. Supreme Court formally recognized that students do not "shed their constitutional rights to freedom of speech or expression at the schoolhouse gate".