Here’s a few:

• Sections of the CIA under the direction of CIA director Alan Dulles conspired to assassinate JFK and cover up the plot. Lee Harvey Oswald was a patsy.
• Julian Assange has been persecuted for several years and spent years in solitary confinement with the use of fabricated and trumped up charges in order to punish him for wikileaks and terrorise others who would think of doing something similar, and to create a chilling effect on journalists. The CIA also plotted to assassinate him, but the plot was not carried out.
• Major oil companies including Exxon have well known since at least the 1970’s how devastating climate change is and will be, and have used their advanced knowledge to devise a long-running propaganda campaign to deny and obfuscate the risks, while shaping politics to avoid any action on climate that would threaten their business model.