What are two of Justice Black's basic reasons for disagreeing with the majority opinion?

The Justice Fortas was an associate justice of Supreme Court of the US. During 1965 students wore armbands to express their discontent with war, the schooling system attempted to suspend them but Justice Fortas ruled in favor of the students because:

The first Ammendment. He believed both students and teachers have the right to freedom of speach in and outside school boundaries.