The conclusion of the program is that the MIB's come from some quasi-private government company (in the sense that Fannie Mae is private), set up to give the government "plausible deniability". There are 24 levels of crypto clearances above top secret, and the president has access only to level 17. MIB's, I guess, reside in the heavens above.
Authors of books on UFO's have died mysteriously. Frank Edwards, author of "Flying Saucers: Serious Business" (1966) died of an "apparent heart attack." Another author died of a blot clot following an ankle sprain.
A blogger named Dave Rosenfeld took some photos and did some gumshoeing around Dugway Proving Ground (LINK) in Utah and posted his findings on the web. Four days later, the MIB's showed up and made him delete the postings from the Web while they watched! Will they make bloggers delete reviews of the History Channel program? Plausible deniability, really?
The MIB's used to be a topic of sniggering discussions at Understanding, Daniel Fry's organization in Arizona ("To Men of Earth"), back in the 1970s.
The History Channel has a discussion board on the program HERE.
Attribution link for Wikimedia drawing of Travis Walton abduction in Arizona in 1975 (the 1993 Paramount film, "FIRE IN THE SKY").
UFO sighting at Yosemite by "Gaspritz".
The second hour of the "UFO Hunters" series was "Area 52" which is Dugway proving ground. By using private contractors, the government gets around FOIA requests.