The Stop Stoning Forever campaign aims to end the use of this form of execution by torture (almost always of women) in Iran. Pressure has obviously had some effect in that Iran did announce the end of the use of the penalty in 2002, but in practice its use has continued and at least nine women and two men are under the sentence.
The petition is here. It explains:
In May 2006, in the city of Mashhad, a woman Mahboubeh M. and a man Abbas H. were both stoned to death. Prior to carrying out the stoning, prior to their death, these two people were treated as if they were dead. In accordance with the Islamic tradition, their bodies were washed as if they were lifeless corpses, and wrapped in the kafan or white shroud. Then their wrapped bodies were buried in the ground, Mahboubeh’s body was buried up to her shoulders, and Abbas was buried up to his waist. The crowd, who had gathered to stone the two to death slowly as specified by law, then targeted them with their stones.