Is the Heckler's Veto a Concept in Law?

The point of the quoe heckler's veto as a legal concept is that the government can't use the real or imagined, threat of some sort of security problem as a excuse tovirat. Brown v louisiana's the first one that used the term but they cite a number of prior cases that dealt with the concept,. even though they didn't have the term yet. But it's t is in that case is a perfect example. It was about a situation where civil rights protesters staged to sit wanted to stage a sit in. They want to get the extra power of just making people be silent and listen to whatever the official channel wants them to help force them to listen to.