Does anyone know any conspiracy theories?

The Illuminati

Black Helicopters

This conspiracy theory emerged in the U.S. in the 1960s. The John Birch Society originally promoted[6] it, asserting that a United Nations force would soon arrive in black helicopters to bring the U.S. under UN control. The theory re-emerged in the 1990s during the presidency of Bill Clinton, and has been promoted by talk show host Glenn Beck.[7][8] A similar theory concerning so-called "phantom helicopters" appeared in the UK in the 1970s.[9]

Explanation:

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