Despite the great legacy of MLK the fact remains that his success (partial) using non-violent methods will not work for socialism. And his grim assassination is a reminder that as you move from a specialized activist movement viz. the Civil Movement to a universal fieldof socialism a new analysis is needed. You are not going to challenge the domination of covert agencies and the crypto-fascist state with peaceful pleading. MLK never really addressed the issue of socialism directly and to say that he was more than a moderate is correct but not enough. He never really made any explicit reference to socialism that I am aware of in the context of an actual program to reach postcapitalism.