So holds the Oberwetter v. Hilliard. The court concluded that
- the Jefferson Memorial qualified as a “nonpublic forum” for First Amendment purposes, so that restrictions on speech there were constitutional if they were viewpoint-neutral and reasonable, and
- the limitation on conduct in the Memorial “which involve[s] the communication or expression … [and] has the effect, intent or propensity to draw a crowd or onlookers” was indeed viewpoint-neutral and reasonable.
Sounds right to me.