My local TV station [SBS Viceland in Australia] is showing all the X Files episodes from start to finish, every week. I wondered about something that I heard a few years ago, in articles like this one from Vulture:Chris Carter Thought the FBI Was Going to Shut Down The X-Files, Like Life Imitating Art:
I can tell you this: When I wrote the  pilot, I called the FBI to do some research, and they were nice enough, but didn’t really give me the time of day. Then, all of a sudden, as we got close to airing, the FBI called and said, “Who are you and what are you doing?” And for a second, I thought it was going to be the long arm of the law coming in to shut me down.
I have come across this claim a few times. There seems to be no agreement based on hard evidence that  Chris Carter got such a phone call from the FBI or  if he did how serious it was.
Is there any definitive answer? Did it happen? I'd like to add that I don't regard a quote from an online news site as being proof that satisfies me.