Mustafa al-Siba'i studied
Islamic theology at
al-Azhar University,
Cairo. While in Egypt he went to lectures by
Hassan al-Banna, founder of the
Egyptian Muslim Brotherhood, and joined the Brotherhood in 1930. Returning to Syria, Siba'i taught at
Damascus University, and in 1940 was made Dean of the Faculty of Theology. In 1941 he established
Shabab Mohammad (Mohammad Youth), a religious paramilitary group based on the Egyptian Muslim Brotherhood. Shabab Mohammad allied itself with the
National Bloc in resisting the French mandate. In 1946, al-Siba'i founded a Syrian branch of the Muslim Brotherhood, leading it through several parliamentary campaigns. After the
United Arab Republic was formed in 1958,
Gamal Abdel Nasser outlawed the Muslim Brotherhood and arrested hundreds of members. Joining the underground, Siba'i supported the 1961 coup ending the UAR. However, the
Ba'athist government which
came to power in 1963 again outlawed the Muslim Brotherhood, and banned many of Siba'i's works. ==Sickness and death==