In 1947 Socialist Party leaders sent five youths, including Sjam, to Jakarta to help republican officials smuggle supplies and money to Yogyakarta, at the time the Indonesian capital.
However, although Sjam claimed in court that he joined the PKI in 1949, according to Mortimer he was listed (under the name of Kamarusaman) in the Suara Sosialis (Voice of Socialism) as a Socialist Party member undergoing intensive party training in Jakarta [REF].