[TIL] In the United States, a 'Heckler's Veto' happens when a speaker is silenced by the threat of antisocial or illegal acts of a disagreeing party. For instance, a peaceful demonstration is banned due to threatened violence by opponents.

https://en.wikipedia.org/wiki/Heckler%27s_veto#:~:text=In%20the%20United%20States%2C%20a,that%20the%20speech%20is%20canceled.

https://www.reddit.com/r/todayilearned/comments/15359yf/til_in_the_united_states_a_hecklers_veto_happens/