Abdoel Firman Siregar gelar Mangaradja Soangkoepon was a politician and Volksraad member in the Dutch East Indies. He was an Indonesian nationalist and was a political ally of many of the leaders who came to power in the early independence era, although he himself died before the country achieved its independence.

Mohammad Yamin was an Indonesian poet, politician, and national hero who played a key role in the writing of the draft preamble to the 1945 constitution.