Amnesty International
One example is Cameron Todd Willingham, who was convicted and executed in Texas for starting a fire that killed his three daughters. Thirteen years later, the Texas Forensic Science Commission ruled that the evidence that supposedly proved the fire was caused intentionally as an act of arson was based entirely on "flawed science" — other scientists also claimed there was no evidence of arson. Willingham is presumed innocent.
For his last meal, Willingham requested tater tots, ribs, enchiladas, onion rings, and two slices of pie before he was put to death. The text reads, "If you can't stomach this, act," prompting people to sign a petition on Amnesty's Facebook page.