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Necklacing is the practice of summary execution and torture carried out by forcing a rubber tire, filled with petrol, around a victim's chest and arms, and setting it on fire. The victim may take up to 20 minutes to die, suffering severe burns in the process.

The practice became a common method of lynching among black South Africans during disturbances in South Africa in the 1980s and 1990s. The first recorded instance took place in Uitenhage on 23 March 1985 when black African National Congress (ANC) supporters killed a black councillor who was accused of being a White collaborator.[1]
Necklacing "sentences" were sometimes handed down against alleged criminals by "people's courts" established in black townships as a means of enforcing their own judicial system. Necklacing was also used by the black community to punish members of the black community who were perceived as collaborators with the apartheid government. These included black policemen, town councilors and others, as well as their relatives and associates. The practice was often carried out in the name of the ANC. Winnie Mandela, then-wife of the imprisoned Nelson Mandela and a senior member of the ANC, even made statements that endorsed its use.[2] The ANC officially condemned the practice.[3]

http://en.wikipedia.org/wiki/Necklacing