Since 1947, UFO witnesses have reported visits from mysterious men in dark suits who warn them not to discuss their sightings. The first widely reported case was Harold Dahl's 1947 Maury Island incident, followed by ufologist Albert Bender's 1953 claim of being threatened by dark-suited men. Reports describe the visitors as having unusual physical characteristics — waxy skin, mechanical speech, and apparent unfamiliarity with ordinary objects. While the Maury Island case was admitted as a hoax, hundreds of MIB reports have been filed across decades. Theories range from government agents conducting psychological operations to suppress witnesses, to something far stranger. The phenomenon preceded and inspired the Hollywood franchise by decades.