I know we have some letters that speak about people who make a disturbance at the Kingdom Halls, and elders are instructed to call the police.
Shameful they will call the police for a meeting disturbance and not for a child who has been molested.
I don't think they call it (hall crashing), I think they call it a "disturbance" and to call the police. The rank&file JW are pretty much on his or her own if someone crashes their literature cart, if the "crashing" is not done on Watchtower property. The JW themselves would have to call the police.
I'll look and see what we can dig out of the Archives as soon as I finish this ham sandwich and ice-tea!