The collection includes correspondence, notes and writings relating to the work of the Communist Party, the Industrial and Commercial Workers Union of Africa (I.C.U.) and other trade unions, labour relations and race problems, as well as S.P. Bunting's contributions at the Sixth Congress of the Communist International in 1928.

The collection also entails correspondence and newspaper articles by Edward Roux, a founding member of the Young Communist League in 1921 and leader in the early Communist Party. Together with S.P. Bunting and his wife Rebecca Bunting, he went to Moscow as a South African delegate to the Sixth Congress of the Communist International in 1928. He wrote a political biography of S.P.Bunting in 1944.