Establishment and aims The
Sarekat Islam (Islamic Association) was a pre-war political organization in the then-
Dutch East Indies. Following a split brought about by the increasing influence of the
Indonesian Communist Party (PKI), at the organization's 1923 conference,
Oemar Said Tjokroaminoto and
Agus Salim set up the Islamic Union Party () to rid the organization of the PKI. The PSII supported Sukarno's efforts to unite Indonesian political organizations following the establishment of the
Indonesian National Party (PNI) in 1927. The PSI changed its name to the Indonesian Islamic Union Party (PSII) in 1929. At the 1930 party congress held in Yogyakarta, the party outlined its six key principles, namely: • Unity of the Islamic
community (ummah) based on
Al Imran verse 102 in the
Quran • Independence of the Ummah in their own country • Democratic national governance in line with
Ash-Shura verse 38 in the Quran • Prosperity of the people brought about by state-owned companies overseen by the people in line with Islamic principles • Equality in life and before the law in line with
Al-Hujurat verse 13 in the Quran • Real Islamic-based independence on the principles of equality and brotherhood
Splits in the party Following allegations of misusing party funds, in 1933
Soekiman Wirjosandjojo and
Soerjopranoto, both senior party figures, were expelled from the PSII. Along with other PSII dissidents, Soekiman formed the Indonesian Islamic Political Party (Parii), and in 1938, after a failed reconciliation with the PSII, the
Indonesian Islamic Party. Meanwhile, the fortunes of the PSII waned in 1934 when the Dutch colonial authorities clamped down on nationalist activities and party leader
Tjokroaminoto died. Following this,
Abikusno Tjokrosujoso (Tjokroaminoto's younger brother) and
S. M. Kartosuwiryo took control of the party. Agus Salim was expelled, and the party began to take a much tougher anti-colonial stance.
The PSII in alliances In September 1937, the Supreme Islamic Council of Indonesia (), a grouping of Muslim organisations including the PSII, was formed by
Mas Mansoer,
Ahmad Dahlan and
Abdul Wahab Hasbullah. Established to discuss religious matters, pressure from the PSII and the
Indonesian Islamic Party at the 1938 conference resulted in it becoming more political in nature. Also in 1938, following discussions between PSII chairman Abikusno Tjokrosujoso and
Soetomo, the leader of the nationalist party
Parindra, the PSII tried to establish an organisation to unite the nationalist movement by inviting delegates from Parindra and two other organisations,
Gerindo and
Paguyuban Pasundan to a meeting in March. This resulted in the establishment of the Mediating Body for Indonesian Political Parties (Bapeppi), but as neither
Gerindo nor
Paguyuban Pasundan were prepared to join it, it achieved nothing. Later that same year,
Mohammad Husni Thamrin from Parindra took the initiative, and was largely responsible for the formation of the
Indonesian Political Federation (GAPI), which brought together all the nationalist inorganizations except the PNI. It included organisations that had taken a more cooperative stance with the colonial government by agreeing to take seats in the
Volksraad quasi-legislature, as well as those that were non-cooperative, such as the PSII. Within GAPI, the PSII was uninterested in international affairs, unlike some other members of the organisation. Within GAPI, it was the foremost campaigner for GAPI's 1939 call for an Indonesian parliament, which Abikusno Tjokrosujoso said had first been demanded by the Sarekat Islam under Tjokroaminoto. Despite the PSII's dislike of working with the "cooperating" parties within GAPI, the party explained that support for a parliament was not a softening of its non-cooperative stance: the party would cooperate with the Dutch only after a parliament had been established. On 12 December 1942, after the outbreak of
War with Japan, GAPI and the executive of the Indonesian People's Council (MRI), an organisation comprising GAPI, the MIAI and the PVPN civil service union released a statement calling for the Indonesian population to cooperate with and obey the Dutch colonial to defend peace and maintain order. Although this led to government finally agreeing to hold talks because Abikusno Tjokrosujoso, a member of the MRI executive, had not been consulted in advance, the PSII withdrew from GAPI and along with the MIAI also left the MRI. In 1942 the
occupying Japanese banned all political activity, and the party announced the closure of its head office on 9 May. Rather than working with the MIAI, in 1943 the Japanese established an organization called
Masyumi in an attempt to control
Islam in Indonesia. ==Post-independence==