[i_am_nomad]

It’s true that Americans are pretty extremist about freedom of speech, but even they understand that speech in the service of actual espionage should be punished. Outside of that I’m unaware of how the Espionage Act has been used to suppress speech.

[dTal]

Let me enlighten you:

https://en.wikipedia.org/wiki/Espionage_Act_of_1917#History