Abdullahi joined the ranks of the opposition and in 1964 the students of the University of Khartoum, the civil servants and transport workers staged demonstrations and civil disobedience that forced the government of Ibrahim Abboud to resign. Abdullahi was elected a second time as a Member of Parliament in the second Sudanese democracy under the leadership of Alazhari, and the government of Alazhari was overthrown in 1969 by Gaafar Nimeiry. Abduallhi again joined the opposition under the leadership of Al-Sadiq Al-Mahadi and was exiled to Saudi Arabia but later on moved to the United Kingdom.