Career
He served on the "Committee of Nine” (Panitia Sembilan) that drafted the preamble (known as the Jakarta Charter) to Indonesia"s 1945 constitution. After independence, he served as the Minister of Transportation in Sukarno"s first Presidential Cabinet, and also became an advisor to the Bureau of Public Works. The PPKI offered the Dutch colonial authorities full support in their defense against the Japanese if they were granted the right to establish a parliament under the rule of the Queen of the Netherlands.
The Dutch refused the offer.
During the Japanese occupation, Tjokrosoejoso was a key figure in Masjumi.
