I have seen this in the past, actually. We have several high-profile inmates who sometimes are moved not just with our members but with members of our institutional emergency response team through the middle of the night. Things are kept quiet, and nobody seems to know.
What has been told to me is that this secrecy is for the inmate's safety and for public safety, because if these types of things were to get out into the media there could be risks involved, and there very well could be.