Among the Brotherhood's more influential members was Sayyid Qutb. Qutb was the author of one of Islamism's most important books, "Milestones". The book called for the restoration of Islam by re-establishing the Sharia and by using "physical power and Jihad for abolishing the organizations and authorities of the Jahili system. Qutb believed these included the entire Muslim world. The book also reveals that Qutb no longer held the Brotherhood's ideas and that he was closer to the ideas of Hizb ut-Tahrir, which is concluded in the introduction and dedication of the book" While studying at university, Osama bin Laden claimed to have been influenced by the religious and political ideas of several professors with strong ties to the Muslim Brotherhood including both Sayyid Qutb and his brother Muhammad Qutb. However, once Al Qaeda was fully organized, they denounced the Muslim Brotherhood's reform through nonviolence and accused them of "betraying the cause of Islam and abandoning their 'jihad' in favour of forming political parties and supporting modern state institutions".