 Establishment of social justice was one of the motivating factors of the Abbasid revolt against the Umayyads.The Shi'a believe that the return of the "Mahdi" will herald in "the messianic age of justice" and the Mahdi along with the Isa (Jesus) will end plunder, torture, oppression and discrimination.For the Muslim Brotherhood the implementation of social justice would require the rejection of consumerism and communism.