Aliens have been working alongside the US and other world governments since at least 1947, when the infamous Roswell UFO crash happened in New Mexico, according to conspiracy theorists.

Steve Bassett, chief executive of the Paradigm Research Group (PRG), is the only registered lobbyist in the US on the issue of "alien and UFO disclosure".

He and many others are convinced the US government has been secretly working with alien visitors since 1947 on developing new technologies, but it has been kept hidden under a worldwide "truth embargo".

He believes this is because of fears on the impact on religion, the rule of law, and the fossil fuel economy.

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