The FBI seems to be on a roll suppressing disgruntled employees who write books critical of the Bureau. First, it spends years trying to kill a manuscript during pre-publication clearance, and now it's harassing a former agent over the use of the FBI seal that appears on his web site and on the cover on his book, a book that was published years ago.
See FBI Lawyers Threaten Bureau Critic for Using Official Seal on His Book Cover for more.
The Bureau's lawyers say they are just trying to enforce a law that prohibits unauthorized use of the FBI seal, but the law in question, 18 USC Sec. 701, clearly does not prohibit fair use by journalists or publishers.