Sayyid Qutb and the Revolution Organized in Egypt Against the Third Khalifah Uthman bin Affaan
Quote from the article (from a Shi'ite source):
Abdullah bin Saba' turned towards Egypt when he knew that the opposers (of Uthmaan) were many over there, and he then made an outward show of knowledge and piety until the people were put to trial by him and after he became firmly settled amongst them he began to spread his madhhab (doctrine) and his method and from it was that every Prophet has a legacy and a successor, so the legacy of Messenger of Allaah, and his successor is none but Ali, the one decorated with knowledge, fatwa (giving verdict) and beautified with nobility, bravery, and described with trustworthiness and piety. So he said, "Indeed the Ummah has oppresssed Alee, has usurped his right, the right of khilaafah, and authority, and it is binding now upon everyone to aid and back him, and to throw aside obedience to Uthmaan and [throw aside] pledge of allegiance to him". So many of the Egyptians became affected by his sayings and opinions and so they revolted against Uthmaan (radiallaahu anhu).