The heckler's veto refers to a situation where a person's or group's right to free speech is suppressed due to the reactions or objections of others, particularly in the context of public assembly. This phenomenon raises concerns about the balance between protecting the right to assemble and ensuring that the expression of differing opinions does not lead to censorship or the silencing of minority voices. It emphasizes the tension between maintaining order and protecting the freedoms guaranteed by the First Amendment.