Perhaps I can assist. I would direct your attention to section 11 of the Witness Protection Program Act, and the strict prohibition there is the disclosure, directly or indirectly, of information about the location or a change of identity. Essentially, what can be disclosed is any information about a person charged in a court proceeding in one of those identities, but the problem is when they link the two together.
The other problem would be to identify them in the witness protection program and their current location, and that's prohibited information. Discussions about a person in their present identity or in their old identity is not a problem, it's when the two identities are linked in some fashion that problems arise.