In the past decades there was a phenomenon that occurred when someone witnesses a UFO sighting and that is the man in black. The men in black are men who are dressed in black suits who claim to be government agents to get information on the UFO sightings that the witnesses saw and who threaten them to keep them quiet about what they have seen.
They’re have been theories that the men in black may be aliens themselves. The term is also frequently used to describe these mysterious men working for unknown organizations, as well as unknown various branches of government allegedly designed to protect secrets and perform other strange activities. This term is so 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 and alien encounters.