On October 8, 1945, an anti-feudalism movement called "Gerakan Tiga Daerah" ("Three Regions Movement") was established in Tegal, Pekalongan, and Brebes. Its goal was to replace the blue-blood regents (related to the kings of Yogyakarta and Surakarta) with ordinary people. According to the leaders of this movement, the old regents had cooperated with the Japanese during World War II and sent people to Japanese slave labor camps. The main leader of "Gerakan Tiga Daerah" was Sarjiyo, who became the new regent of Pekalongan. Others were Kutil, K. Mijaya and Ir. Sakirman. Ir Sakirman was the local leader of the PKI. The government of the Republic of Indonesia in Yogyakarta opposed "Gerakan Tiga Daerah" and declared it illegal.