The African Blood Brotherhood was initially a secret organization made up of socialists. They were class-oriented nationalists, but focused on the fights within the United States around lynching and disfranchisement. How did they get folded into the Communist Party? That's all up to dispute. Some of them actually joined the Communist Party before the ABB folded. It wasn't until like 1923 really, when, or maybe 22, that the Communist Party became one party.