There has always been a problem within the order and that is the inclusion of certain aliens and humans that are not of the same race as the order elite. The highest council of the order is made of some of the most advanced species of the universe and this is one of the reasons why we never allow humans to be part of the inner circle of the order. We have brought in some humans and other alien life forms that have become problematic for us and this has caused us to throw them out of the order forever.
The alien subjects that have been thrown out are deported from the planet and the humans are allowed to resume work in other areas and would be labeled as crazy and delusional if they ever attempted to uncover the secrets that they know. We have plenty of security measures to ensure that no humans could ever expose the order to the world.