Of course, Cheney has not acted alone in his actions. But he's been an important player in many different arenas and is, perhaps, the most widely-known figure who has had a hand in all of the above-described events. Cheney might not be the ultimate Mr. Big in these crimes, but he appears to have gotten his hands dirtier -- and to be closer to the true seat of power -- even than Mr. Bush.
In addition, while Cheney was not solely responsible for the above-listed actions, he hired many of the people who caused the mischief, such as the chief architect of the Iraq war - Paul Wolfowitz.
See also this round-up of Cheney's actions.
Note: If any of the links have become broken over the last 2 years, let me know, and I will fix them.
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