Kwame NkrumahBro. Nkrumah (1909-72), first prime minister (1957-60) and president (1960-66) of Ghana. A firm believer in African liberation, Nkrumah pursued a radical pan-African policy, playing a key role in the formation of the Organization of African Unity in 1963. As head of government, he was less successful, and as time passed he became increasingly dictatorial. Finally overthrown by the military in 1966, he spent his last years in exile, dying in Bucharest, Romania, on April 27, 1972.