The clenched raised fist is perhaps meant to symbolise solidarity, but to me invokes ideas of supremacism - not really what I look for in a shirt. Also, as others have expressed more artfully than I elsewhere, excessive copy and paste seldom makes for a compelling design.
Both the white fist and the black fist are symbols of white and black power. I know I have seen almost that exact same white fist symbol used by white supremacist groups.
I think your message is lost in that your symbols are white and black and always seperate, they are making fists which could be considered to be hostile and in some cases the white and black fists are standing off agaianst each other.
About my design
AS ONE can link together and create great things
onelove