>"Fire in a crowded theater" is intolerable speech, and so is publicly calling for executions. It's enshrined in jurisprudence.
Directly threathening to execute someone maybe. But "Fire in a crowded theater" has not been part of jurisprudence for... 40 years. The US has very, very limited free speech restrictions.
US only, other nations probably have larger lists of free speech exclusions: https://en.wikipedia.org/wiki/United_States_free_speech_exce...