The resistance against Uthman arose because he favoured family members when choosing governors, reasoning that, by doing this, he would be able to exact more influence on how the caliphate was run and consequently improve the capitalist system he worked to establish. The contrary turned out to be true and his appointees had more control over how he conducted business than he had originally planned. They went so far as to impose authoritarianism over their provinces. Indeed, many anonymous letters were written to the leading companions of Muhammad, complaining about the alleged tyranny of Uthman's appointed governors. Moreover, letters were sent to the leaders of public opinion in different provinces concerning the reported mishandling of power by Uthman's family. This contributed to unrest in the empire and finally Uthman had to investigate the matter in an attempt to ascertain the authenticity of the rumours. Wilferd Madelung discredits the alleged role of Abdullah ibn Saba in the rebellion against Uthman and observes that "few if any modern historians would accept Sayf's legend of Ibn Saba".