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It is the group Amnesty International that helps get convicted people pardons for past offenses, although it should be noted that this is not always effective. 

Amnesty International is the group that works to help get pardons for past offenses.  Amnesty International refers to a global movement made up of more than sevel million people who take injustice personally. They campaign across the entire world seeking to achieve the fulfilment of human righst for all.  

The stated purpose of the organization is to campaign for "a world in which every person enjoys all of the human rights enshrined in the Universal Declaration of Human Rights and other international human rights instruments."