The presence of such a tradition. [fact]
Before the African and New World Black liberation movements of the post–Second World War era, few Western scholars of the African experience had any conception of the existence of an ideologically based or epistemologically coherent historical tradition of Black radicalism. The presence of such a tradition, the possibilities and conditions of its existence were literally and configuratively alien to these observers.
Cedric J. Robinson, Black Marxism_ The Making o…, loc. 422