ビンタン島
In the early 1960s, when Sukarno served as the president of Indonesia, the MCP could organise activities publicly. Through the co-operation with Communist Party of Indonesia, Eu established Malayan National Liberation League. In 1963, he served as the secretary of the Southern Bureau of the MCP and made guidelines for underground activities in Singapore. To avoid a concentration of members in Jakarta and prepare for the resumption of underground activities in Malaya, many party members were sent to Medan, Aceh, Bagansiapiapi of Sumatra and to Bintan Island and Batam Island of the Riau islands, in mid-1964. These member helped to establish new bases or new liaison stations.