First of all, there were no blacks killed in the holocaust, googling "Black Holocaust Victims" will simply bring you mislabeled pictures of starving african tribes… but there WERE black Nazis…
Hitler wanted to retrieve the German East African territories that we're lost after WWI, so he got a man named Fritz Delfs to go to Tanganyika to form an African branch of the Nazi party.
Delfs' Party wasn't large, and there are only a few photos of it online, but it seems he recruited another guy to lead the Party (the man pictured on the left), as there are
more pictures of him than the other members of Delfs' Party.
Their flag was like the usual Nazi flag, only the "arms" on the swastika were shortened and there was a gold-colored circle on it.
And… that's all i'm gonna say for this part. :P