Chuck Grimes
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On the history of left analysis of the intertwined issues of class and race, especially in the US, racism is the main tool used by the ruling class to divide the working class, and thwart working class victory in the class struggle. In _Capital_, Karl Marx said that labor in the white skin shall not be free while labor in black skin is branded. But the principle centrality of the liberation and equality of African-Americans, and other oppressed races and nationalities to working class liberation has continuing validity today. Sloganeering, it was in the mid-twentieth Century "Black and white, unite and fight".
In fact, this idea is a specific of the main Marxist slogan "Workers of all countries, unite". Lenin expanded the slogan to combine ant-capitalism and anti-imperialism "Workers and oppressed peoples of all nations , unite."