The comic book The Men in Black was created and written by Lowell Cunningham, illustrated by Sandy Carruthers, and published by Aircel Comics. Aircel would later be bought out by Malibu Comics, which itself was bought out by Marvel Comics. Three issues were published in 1990, with another three the following year.
In The X-Files television show, The Men in Black (MIB for short, and singular, Man in Black) refer, unofficially, to a group of enforcers employed by the Syndicate to take care of the dirty work of the conspiracy (i.e., murders, intimidation, sabotage, cover-ups, etc). Most of them were ex-military, highly trained, loyal, cold-blooded, mafia-style hitmen, who worked, as a front, in government agencies such as the FBI, DOD, and NSA. Some, mostly shown in comedic episodes, parodied the traditional view of MIBs from UFO lore.