Free speech is a perennial hot topic. It’s one of the rights guaranteed to US citizens in the Bill of Rights. However, not all speech is protected under the First Amendment. Certain kinds of speech are, in fact, illegal.

For example, this December a North Carolina man was convicted for communicating a death threat on Twitter. The man sent threatening images and a death threat to another Twitter user whose beliefs he did not agree with. 

The specific charge was making a threatening communication in an attempt to injure another person through interstate [...]