So long as they don`t tread on that church`s property or commit acts of violence, not much can be done... violent attacks are a different story.
This OWS mob is similar to Luther’s mob: co-opting justified popular frustration, up-ending everything that reminds people of the status quo, and grabbing power.
Popular determination of objective sin is the root of protestantism, and it was born of sinful over-reaction to the sins of others. Meeting sin with sin is never a good idea.
When I was in school some of the Turkish students were going to a Turkish parade in NYC; they brought along some local black Guardian Angels in case other groups tried to disrupt them.
Nobody tried to disrupt them.