Holder v. Humanitarian Law Project ruled that knowingly providing material support to designated terrorist organizations is not protected by the first amendment. https://supreme.justia.com/cases/federal/us/561/1
But I'm curious about your take on this. How would you argue the first amendment protects this?
So it's trivial that if you are the government and you want to arrest someone for speech, you first call them a terrorist organisation and then you can arrest them for speech? Ridiculous.