What's a conspiracy that you believe to be true?

Thought I'd get another interesting thread going.

Pretty easy question, again. What's a conspiracy theory, that you honestly believe to be true. Please no meme posts like:

Quote:Hurr hurr we no land on moon

Genuinely curious what people believe to be true.

For me it would have to be the JFK Assissination. I don't believe Lee Harvey Oswald was the sole person behind it, and I think there were government connections set in place.