Sukarno implemented his plan for guided democracy by issuing a decree restoring the 1945 Constitution. The PSI was not represented in either the new cabinet, the Supreme Advisory Council nor the National Planning Council established under the new system. Finally, in August 1960, President Sukarno formally banned the PSI and the Masyumi Party for their opposition to Guided Democracy and their alleged support of the PRRI rebellion.Ricklefs (1991) pp. 254-256
