Believers say that dozens have died – with killings stretching back as far as 1947 – and that the assassination of JFK may have been arranged to stop him revealing the truth about UFOs. Nigel Watson, author of the UFO Investigations Manual, says, ‘The idea that UFO researchers are being murdered implies there is some form of conspiracy and organisation behind them. ‘It relates to the concept of Men in Black (MIB),who are either aliens in human disguise or government agents, who stop UFO witnesses from making their sightings public. MIB usually verbally intimidate people, but it seems logical that ‘they’ would stretch to violence and murder when needed. As long ago as 1971, researcher Otto Binder claimed that at least 137 UFO investigators had died under mysterious circumstances during the 1960s. But the figures might be deceptive: there are a huge number of UFO believers, ‘researchers’ and authors, most of whom have lived normal lives. Nigel Watson says, ‘Certainly, several UFO researchers have died in unusual circumstances or have committed ‘suicide’ but they are a very small number compared to the number of UFO researchers who have spoken openly about UFOs for decades and have never been troubled by MIB or alien murder squads.