The order knows that all alien life needs to be monitored in order to keep things in order on this planet. This is the main reason why we are always making sure that everyone working with us is always monitored. We also monitor human life but we know that humans are harmless individually and can only pose threats when they combine efforts. This is not the case with alien life forms that can obliterate the entire planet if they wanted to do this.
The order keeps a close eye on all alien life in this planet with special radars that locate all incoming objects from space. We have detected that there are so far 125 alien species on our planet and some of them need to live in complete seclusion in order to avoid any suspicion by humans about aliens living on this planet. Several dozen species that want to be granted permit to inhabit the Earth do.