Marxism is a little tough because for much of the twentieth century you had the split between Soviet and western marxism, where the Soviet branch considered its

Marxism is a little tough because for much of the twentieth century you had the split between Soviet and western marxism, where the Soviet branch considered itself properly "scientific" while the western branch engaged with more humanist themes from philosophy. In my opinion the philosophy of science developed in western marxism is much more interesting than the scientism of the Soviets. German philosopher Max Horkheimer's essay "Critical and Traditional Theory" (1937) is a classic and very influential formulation of a western marxist philosophy of science. I don't know about African American philosophy, but among Latin American philosophers Enrique Ambrosini Dussel has done much to advance a unique perspective on epistemology and philosophy of science. In the English-speaking world his work has been championed by Sandra Harding, who was mentioned by another commenter.