My top 3:
1. Chemtrails
2. Climate Change Conspiracy
3. Moon Landing Conspiracy
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While it might not be a true conspiracy I am going to go ahead and put down PETA. I put them here because they believe that animals are slaves. People that own pets are bad people and the pet slaves should be left to run free into the wild. Violence against people who own pets, eat meat or do medical research is encouraged because it will end animal slavery. Dead animals are yummy. Domesticated animals live in a symbiotic relationship with us. PETA is a terrorist organization.