Yes. I know of people who have applied for positions with the FBI---EVERYTHING was asked...every place they ever lived (house number, street address, city and state) and for how long...names of neighbors, names of all friends, names of all family members, I believe not just immediate, all individuals they ever lived with, name/place of every school of attendance and duration, all medical history, criminal background, places of employment, and, I believe, any political rallies/organizations/campaigns in which they ever participated...there may be more info. requested....I just can't remember everything....
I had been asked to help out answer telephones for the Republican party in Palm Desert, CA, many years ago. I think it was because then-Vice President Dan Quayle was coming into town a few days later. I got to meet one of the CIA guys....got to talk to him for hours while I answered the phone. He was there as part of the "lead team" prior to the VP's arrival in Palm Desert. That night, I was called and asked if I would "credential" the press the next day for when the VP flew in, which I did. I had to report to the tarmac and then i.d. every reporter who would have access to the VP before letting them into the press area. I was then allowed to stand there with the press and watch the VP arrive, walk off the plane and across the tarmac....I even got to shake his hand (very exciting). I was told, years later, by a policeman, that I would NEVER have been asked to credential the press had I not first had an FBI or CIA background check first. (Of course, I wasn't told about any FBI/CIA background check)......but there's no way I would have had personal access to the VP without having been checked out first....therefore, I must assume I also have an "FBI file."