I HAVE AN INTERESTING QUESTION TO POSE TO YOU..?

If you invited 10 guests to your house and you found out from some sources that 1 or mabey two of these guests were planning to kill your family once in your home, but they were unsure which of the guests it was who planned this terrible act...what would you do?? Now we in Britain and Europe invite guests to our countries to live and work and prosper and improve themselves, now if some of those plan to kill or disrupt our societies....what do we or can we do????