TMEP § 720
If an examining attorney suspects the possibility of fraud upon the USPTO in the ex parte examination of a trademark application, the following procedure must be followed.
Under no circumstances should any USPTO communication pertaining to fraud be made, either orally or in writing, by anyone in the Trademark Examining Operation, except as set forth in paragraphs 1 and 2 above.
These issues may ultimately be referred to the Office of Enrollment and Discipline.