The 1951 August Raid was Indonesia's largest peacetime mass detention, targeting suspected communists to forestall an alleged PKI coup.
Key Facts
- Total detainees
- Roughly 15,000 across Indonesia by October 1951
- Initial arrests
- Several hundred in early August 1951
- Regions affected
- Java and Sumatra
- Governing cabinet
- Soekiman Cabinet
- Detentions ended
- Most released; remainder freed after April 1952
By the Numbers
Location
Cause → Event → Consequence
The Indonesian government under the Soekiman Cabinet received reports of a rumoured coup planned by the Communist Party of Indonesia (PKI) and allied leftist groups. Fearing an imminent seizure of power, authorities decided to act preemptively against communist and leftist organizations operating in Java and Sumatra.
In August and September 1951, Indonesian security forces conducted sweeping mass arrests known as the August Raid (Razia Agustus), detaining suspected communists and leftists across Java and Sumatra. Beginning with several hundred in early August, the total number of detainees grew to approximately 15,000 by October 1951.
Many of those arrested were released without formal charge within days or months. However, a portion remained in detention until the Wilopo Cabinet assumed power in April 1952. The episode demonstrated the Indonesian government's willingness to use large-scale preventive detention against political opponents, particularly the PKI.