The Petition of Fifty (Indonesian: Petisi 50) was a document protesting then President Suharto's use of state philosophy Pancasila against political opponents. Issued on 5 May 1980 as an "Expression of Concern", it was signed by fifty prominent Indonesians including former Army Chief of Staff Nasution, former Jakarta governor Ali Sadikin and former prime ministers Burhanuddin Harahap and Mohammad Natsir.