The Real Men in Black, by Nick Redfern

Its certainly one of humanities enduring mysteries, & Nick Redfern provides some fascinating insight on the subject.

http://therealmeninblack.blogspot.com

http://nickredfernsbooks.blogspot.com/2011/05/real-men-in-black-2011.html

Nick has been on coasttocoastam.com several times & was on Dreamland & Veritasradio.com talking about his research. www.redicecreations.com/radio/2011/08 /RIR-110821-SUB.html

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There seems to be some variation on the MIB shape or form throughout history. Lots of people have their own take on the MIB.

http://www.theforbiddenknowledge.com/hardtruth/real_men_in_black.htm