Ironically, the S. Court has a large buffer zone to prevent protests on its 252-by-98-foot plaza
http://thinkprogress.org/health/2014/06/26/3452966/buffer-zones-scotus/ :
Buffer zones are not entirely unusual policies. There are already buffer zones around funerals and polling places. Ironically, the Supreme Court itself has a large buffer zone around it to prevent protesters from picketing on its 252-by-98-foot plaza, requiring demonstrations to take place on the sidewalk.
(More at the link.)
http://www.firstamendmentcenter.org/full-8th-circuit-mo-town-can-limit-funeral-protests :
Members of the church frequently protest at funerals of soldiers with signs featuring messages like Thank God for dead soldiers and Thank God for 9/11, claiming the deaths are Gods punishment for American immorality and tolerance of homosexuality and abortion.
The Manchester ordinance allows for protest activities but with limitations. Among them: Protesters are not allowed within 300 feet of a funeral or burial service while it is occurring and for one hour before and one hour after.
Eighth Circuit Judge Diana Murphy wrote in todays ruling in Phelps-Roper v. City of Manchester, Mo. that the ordinance survives First Amendment scrutiny because it serves a significant government interest, it is narrowly tailored, and it leaves open ample alternative channels for communication.