Sarino Mangunpranoto became involved in the Struggle for independence, when he joined Partindo, and ran political courses for the movement in Slawi, where Taman Siswa's regional headquarters were located.[2] Sarino's nationalist sympathies made the Taman Siswa school in Pemalang a safe meeting place for various nationalist groups and organizations. Many of his former students would become prominent leaders during the Indonesian National Revolution.[3]
Following the Japaneseinvasion of the Dutch East Indies, the new Japanese administration closed the Taman Siswa school system in March 1943, and Sarino then moved to Pati, which is located east of Semarang, where he spent his life founding and managing a sea-fishery cooperative during the occupation. During the early Indonesian National Revolution, Sarino played an important role in the establishment of a Republican government in the region.[3]
After the First Clash between Dutch and Republican forces, he joined the evacuation of Republican administrations from Java's north coast and, when he arrived at Wonosobo, helped set up a residency government "in exile" there. Sarino was also and active as a member of the Indonesian National Party, founding a branch in Pati and being elected to its central leadership in 1948.[3] Following the end of hostilities after the Dutch–Indonesian Round Table Conference, he became a member of the Senate of the United States of Indonesia (USI), representing Central Java, under speaker Melkias Agustinus Pellaupessy.[4][5]
In a conversation with Anton Lucas, who would write a book about Sarino, Sarino talked about the philosophical ideas of the Taman Siswa movement, as well as its founder (who was also Sarino's mentor), Ki Hajar Dewantara. He often quoted the phrase "tut wuri handayani" ("to lead from behind"). Some of those who knew Sarino felt that he epitomized the high Javanese ideal of "sepi ing pamrih, rame ing gawe" ("working industriously without personal ambition").[9]
Writings
Although politics and foreign affairs occupied much of his career, he considered his foremost work to be in education, with a close friend saying "he was a natural educator." He released his first articles in 1932, at the Pandji Pustaka and Bintang Timoer magazines, on the subject of education. He also wrote on the educative value of children's games for the Taman Siswa journal Madjalah Pusara. Among his numerous articles, Sarino considered Sosio-Nasional Demokrasi (Which was published in Taman Siswa, 1946), Pokok Pikiran Politik Pendidikan Indonesia (Which was published in the Department of Education dan Culture, 1975), and Setahun Cabinet Ampera (Which was published in the Department of Education dan Culture, 1967).[9]