Men in Black

Conclusion
The MIB are alien police.  When someone sees a UFO, sometimes the MIB come to their home and tell them not talk about what they saw.  They can't enter your house unless you invite them in. They are aliens or robots.  They have been interacting with humans for a long time. They wear black suits, but in the past they wore robes.  They selected kings in Africa.  The MIB are strange entities that monitor people.    They have a humanoid body.  They eyes are all black.   They are very mysterious.  They are emotionless.  They have teleportation abilities.   Credo Mutwa knows about the MIB.  They may come from Orion or Sirius.  Men in Black the movie is based on the real MIB. 

References
http://www.ufoevidence.org/documents/doc1701.htm
http://listverse.com/2014/05/27/10-creepy-stories-of-encounters-with-men-in-black/
http://humansarefree.com/2013/12/the-real-men-in-black-complete-accounts.html
http://www.ufos-aliens.co.uk/cosmicmib.htm
http://www.bibliotecapleyades.net/vida_alien/alien_krllpapers01.htm#The Men in Black