Parti ouvrier français
The split had two root causes: personality problems, as Hyndman was accused of leading the SDF in a dictatorial fashion, and disagreements on the issue of internationalism. In this point Hyndman was accused by Marx among others of nationalist tendencies. He was, for example, opposed to Marx's idea of sending delegates to the French Workers' Party calling the proposal a "family manoeuvre", since Eleanor Marx's sister Laura and her husband Paul Lafargue were members of that party. Therefore, both Marx and Aveling became founding members of the Socialist League, whose most prominent member was William Morris.