The All-Indonesian Federation of Workers' Organisations (Indonesian: Sentral Organisasi Buruh Seluruh Indonesia (SOBSI)) was the largest trade union federation in Indonesia. Founded during the period of the country's independence in the late 1940s, the federation grew rapidly in the 1950s. Initially formed with loose connections to the Communist Party of Indonesia (PKI) and with members from other parties, over time the PKI became dominant in the organisation. With the introduction of President Sukaro's guided democracy in the late 1950s, SOBSI was formally recognised and given a place in the national decision-making structures. In the 1960s, SOBSI came into conflict with the Army, whose officers controlled the country's state enterprises. Following the 1965 coup that subsequently produced