 Tan Cheng Lock was appointed the chairman with MDU's Paul Eber as Secretary-General.A memorandum of protest was sent by the CJA to Arthur Creech Jones, a trade unionist who was then the Under-Secretary of State for the Colonies for the British government on 16 December of the same year with the announcement that the CJA intended to boycott the Consultative Committee established to discuss and implement the Anglo-Malay Proposals.This CJA was expanded on 22 December 1946 with the inclusion of the Pan Malayan Federation of Trade Unions, the Clerical Unions of Penang, Malacca, Selangor and Perak, the Selangor Indian Chamber of Commerce, the Selangor Women's Federation, the Malayan New Democratic Youth's League, the Malayan People's Anti-Japanese Ex-Comrades Association, the Singapore Chinese Association and the Peasant's Union.