...Mehanna, who had become increasingly radical in his views, traveled to Yemen in 2004 seeking terrorism training, so he could carry out jihad, or holy war, against US soldiers in Iraq.

After failing to find training there, he returned to the United States, determined to help Al Qaeda by translating and distributing propaganda promoting jihad on the Internet...

Yeah what a shame. He certainly sounds like a nice enough guy.

Curt

Criticism of the government and advocacy of unpopular ideas that people may find distasteful or against public policy, such as racism, sexism, and other hate speech are almost always permitted. There are exceptions to these general protections, including the Miller test for obscenity, child pornography laws, speech that incites imminent lawless action, and regulation of commercial speech such as advertising.

The canonical example, enunciated by Justice Oliver Wendell Holmes, is falsely yelling "Fire!" in a crowded movie theater (This example was authored in Schenck v. United States, but still passes the "imminent lawless action" test). The trend since Holmes's time has been to restrict the clear and present danger exception to apply to speech which is completely apolitical in content.