conspiracy theory

noun
1.
a theory that explains an event as being the result of a plot by a covert group or organization; a belief that a particular unexplained event was caused by such a group.
2.
the idea that many important political events or economic and social trends are the products of secret plots that are largely unknown to the general public.

conspiracy theorist, noun
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World English Dictionary
conspiracy theory
 
n
the belief that the government or a covert organization is responsible for an event that is unusual or unexplained, esp when any such involvement is denied

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Most recently this conspiracy theory hijacked health-care reform.
Conspiracy theory and confirmation bias are the best you have to offer.
Real science quotes repeatable experiments, or it's not a far cry from
  conspiracy theory.
Here is a little bit of a conspiracy theory on algae as a bio-fuel.
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