After the September 2011 execution of Troy Davis, believed by many to be innocent, Richard Dieter, the director of the Death Penalty Information Center, said this case was a clear wake-up call to politicians across the United States. He said: "They weren't expecting such passion from people in opposition to the death penalty. There's a widely held perception that all Americans are united in favor of executions, but this message came across loud and clear that many people are not happy with it." Brian Evans of Amnesty International, which led the campaign to spare Davis's life, said that there was a groundswell in America of people "who are tired of a justice system that is inhumane and inflexible and allows executions where there is clear doubts about guilt". He predicted the debate would now be conducted with renewed energy.