Men in black

In popular culture and UFO conspiracy theories, men in black (MIB) are supposed men dressed in black suits who claim to be government agents who harass or threaten UFO witnesses to keep them quiet about what they have seen. It is sometimes implied that they may be aliens themselves. The term is also frequently used to describe mysterious men working for unknown organizations, as well as various branches of government allegedly designed to protect secrets or perform other strange activities. The term is generic, used for any unusual, threatening or strangely behaved individual whose appearance on the scene can be linked in some fashion with a UFO sighting. Several alleged encounters with the men in black have been reported by UFO researchers and enthusiasts.

Folklorist Peter Rojcewicz compares accounts of men in black to tales of people encountering Lucifer and speculates that they can be considered a kind of "psychological drama".

Men in black figure prominently in ufology and UFO folklore. In the 1950s and '60s, UFOlogists adopted a conspiratorial mindset and began to fear they would be subject to organized intimidation in retaliation for discovering "the truth of the UFOs".

In 1947, Harold Dahl claimed to have been warned not to talk about his alleged UFO sighting on Maury Island by a man in a dark suit. In the mid 1950s, the ufologist Albert K. Bender claimed he was visited by men in dark suits who threatened and warned him not to continue investigating UFOs. Bender believed the men in black were secret government agents tasked with suppressing evidence of UFOs. The ufologist John Keel claimed to have had encounters with men in black and referred to them as "demonic supernaturals" with "dark skin and/or “exotic” facial features". According to the ufologist Jerome Clark, reports of men in black represent "experiences" that "don’t seem to have occurred in the world of consensus reality".

Historian Aaron Gulyas wrote, "during the 1970s, 1980s and 1990s, UFO conspiracy theorists would incorporate the Men in Black into their increasingly complex and paranoid visions".

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