The inability to combine a coherent critique of the state and capitalism with a critique of racism has exacted an enormous toll on anarchism. The capitalist system we inherited thrives on the exploitation of workers and other non-dominant classes and also exploits racial differences. It has instituted a permanent racial dichotomy among workers, where there is a group of privileged workers and another, not so privileged group. This was not properly addressed even by Marxism, because it assumed a unity of interests among the working class without reference to the specific kinds of exploitation and deprivation faced by workers. Racism is a key factor in this world and any working class analysis that seeks to deny this is only being escapist.
Racism is simply endemic in capitalism.
It is for workers to comprehend this, as a basis for unity within their own ranks and to move forward. This must be recognized by anarchist activists and social movements, so as to integrate blacks and whites to face a common enemy, which is capitalism and the social relations of production that it puts in place.