Final answer:
Tinker v. Des Moines established the right to symbolic speech for students in schools, reinforcing the protection of First Amendment rights on school property unless it causes substantial disruption.
Step-by-step explanation:
The landmark case of Tinker v. Des Moines Independent Community School District established constitutional protection for the right to symbolic speech in schools. In December 1965, students planned a public showing of support for a truce in the Vietnam war by wearing black armbands and fasting. The Supreme Court held that the students did not lose their First Amendment rights when they stepped onto school property, and any act to suppress their speech must show evidence of material and substantial interference with school operations.