How did justice Fortas's concept of "pure speech" extend first amendment free-speech rights i really need help please

Justice Fortas's concept of "pure speech" extend First Amendment free speech rights even though it was speaking, it still was almost a silent protest, which is still considered under the freedom of speech.

Explanation:

This is there paragraph I got it from:

On February 24, 1969, the United States Supreme Court in a 7–2 decision declared the school suspensions unconstitutional. Justice Abe Fortas, who wrote the majority opinion, first established that the students’ action was “akin [similar] to pure speech.” Even though their protest involved no speaking, he argued, it deserved “protection under the First Amendment.” In the key passage of the opinion, Justice Fortas wrote:

"It can hardly be argued that either students or teachers shed their constitutional rights to freedom of speech or expression at the schoolhouse gate."

-United States Supreme Court Justice Abe Fortas

the real gdp increased by 4.1%

explanation:

might not be right, i think i'm correct, but i might be thinking of last quarter