Melbourne; i referred to them as such because it is a chutzpah nora and an insult for one group to send troops of bochurim and “mashpiim” to litvishe and chasidishe yeshivos to try and convert hapless talmidim and make them leave their mesorah.
I never called the police, we simply threatened to if they did not leave, because a Yeshiva is a place for talmidim and anyone who wants to learn Torah. It is not a street corner where you get up on a soapbox and preach. If you don’t have permission from hanhalah to give a shiur or even just be there, you are allowed to remove them by any means necessary just as you would an intruder in your house