Pledging his loyalty to the Central Government, the Tunku and his colleagues, Lee asked for ‘an honourable relationship between the states and the Central Government, a relationship between brothers, and not a relationship between masters and servants'. The Singapore and federal governments had disagreements on the economic front. As part of the Malaysia Agreement, Singapore agreed to contribute 40% of its total revenue to the federal government and provide largely interest-free loans to Sabah and Sarawak, in exchange for establishment of a common market. However in July 1965, Malaysian Finance Minister Tan Siew Sin proposed raising the contribution to 60% and hinted 'that unless Singapore agrees to pay more, the common market would be slow in coming about'. This was refused by Singapore's Finance Minister, Dr Goh Keng Swee, who accused Kuala Lumpur of imposing tariffs on Singapore-made products. Both sides also disagreed over the issuance of the loan, but agreed to refer this issue to the World Bank for arbitration. The Federal Government of Malaysia, dominated by the United Malays National Organisation (UMNO), was concerned that as long as Singapore remained in the Federation, the "bumiputera" policy of affirmative action for Malays and the indigenous population would be undermined and therefore run counter to its agenda of addressing economic disparities between racial groups. One of the major concerns was that the PAP continued to ignore these disparities in their repeated pledges for a "Malaysian Malaysia" – the equal treatment of all races in Malaysia by the government which should serve Malaysian "citizens" without any regard for the economic conditions of any particular "race". Another contributing factor was fear that the economic dominance of Singapore's port would inevitably shift political power away from Kuala Lumpur in time, should Singapore remain in the Federation. Racial tensions increased dramatically within a year. They were fuelled by the Barisan Sosialis's tactics of stirring up communal sentiment as the pro-Communist party seeking to use means to survive against the crackdown by both the government of Singapore and the Federal Government. In particular, despite the Malaysian government conceding citizenship to the many Chinese immigrants after independence, in Singapore the Chinese disdained the Federal policies of affirmative action, which granted special privileges to the Malays guaranteed under Article 153 of the Constitution of Malaysia. These included financial and economic benefits that were preferentially given to Malays and the recognition of Islam as the sole official religion, although non-Muslims maintained freedom of worship. Malays and Muslims in Singapore were being increasingly incited by the Federal Government's accusations that the PAP was mistreating the Malays.