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

food and resources were plentiful.

women were encouraged to marry later in life so they could work in factories.

the chinese communist party (ccp);

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