Between 1977 and 1978, ERT Madjitey served as a member of the Constitutional Drafting Commission which drew up the Constitution for Ghana's Third Republic. He was also a member of the 1979 Constituent Assembly consequently set up to defend and ratify the Draft Constitution. When the SMC under Gen. Akuffo lifted the ban on political activities. Madjitey helped found the Popular Front Party led by Victor Owusu in 1979 which became the main opposition party in the Third Republic. He was also a founding member of the New Patriotic Party, which was again the main opposition party in the first two parliaments of the Fourth Republic but won power in December 2000.