How about this one? https://en.wikipedia.org/wiki/IRS_targeting_controversy
EDIT: Twitter literally suppressed the leaks of DNC and Podesta emails hashtags and admitted to it:
Is that conspiracy enough for you?
How about this:
On October 31, 2016, The New York Times reported: "CNN has severed ties with the Democratic strategist Donna Brazile, after hacked e-mails from WikiLeaks showed that she shared questions for CNN-sponsored candidate events in advance with friends on Hillary Clinton's campaign."
And that's just off the top of my head.
EDIT 2: Can you explain how all these very similar headlines were possible without there being a conspiracy? And yes, those are real, I saw it when it happened.