Neo-Colonialism, the Last Stage of Imperialism is a must read for leftists
Nkrumah is one of the architects of pan-Africanism and his impacts in that regard are legendary, he permanently changed the way that Africans and new Afrikans would view the process of decolonisation and liberation.
Ghana has a lot of workers co ops and community organizations still today and I have several friends who have visited and had a great time