In February 1957 the Anti-Imperialist Front and the Sudanese Workers' Trade Union Federation began campaigning against the introduction of a U.S. aid programme.[1] The Anti-Imperialist Front struggled against the electoral law passed by the Umma-PDP coalition in June 1957, claiming that the law had been tailor-made to guarantee an Umma Party victory in the coming elections. The Anti-Imperialist Front again called on the PDP to break its alliance with the Umma Party, and join a coalition with the National Unionist Party.[16]