Claudia Jones was born in Trinidad in1915 but migrated to Harlem in 1924. She became active in the Scottsboro struggle. She became a leader of the Comunist Party in the 1940’s, until she was indicted under the Smith Act (under which teaching Marxism was illegal) and imprisoned in 1955. She was then deported to London, where she lived and worked until her death 1965. She was buried beside of Karl Marx.
To get an idea of her importance, read her article, “An End to the Neglect of the Problems of the Negro Women” (PDF), which analyzed the situation of black women from a Marxist viewpoint, and which was her major contribution to feminist thought.