Answer:
Tinker v. Des Moines
Step-by-step explanation:
Tinker v. Des Moines was the case that landed and solidified freedom of speech in public schools in the United States of America. In 1969, the Supreme Court ruled in favour of Tinker that students and teachers will fully express their constitutional rights to freedom of speech at the schoolhouse gate.
The case started with Mary Beth Tinker in junior high in December 1965 when she and a group of students wore black armbands to school to protest war in Vietnam. They were suspended as result and when they returned to school, they filed a first amendment lawsuit which brought about the Supreme Court ruling