Black Tambourine -- Hart Crane

I'm not quite sure what Crane is meaning in this poem (surprise, surprise!). I know that Crane wrote this poem when he was in the cellar with his fathers black workers in the candy mill. Crane would sneak down there to be with them rather than working. I suppose Crane means to speak against the treatment of black men compared to white workers. The mention to Aesop threw me a little. It could mean that even black men (because Aesop was black) can be great writers and find solace in the same thing he does. Talent does not discriminate, even if people do.