Early modern Indonesian literature originates in the Sumatran tradition. Literature and poetry flourished during the decades leading up to and after independence. Balai Pustaka, the government bureau for popular literature, was instituted in 1917 to promote the development of indigenous literature. Many scholars consider the 1950s and 1960s to be the Golden Age of Indonesian Literature. The style and characteristics of modern Indonesian literature vary according to the dynamics of the country's political and social landscape, most notably the war of independence in the second half of the 1940s and the anti-communist mass killings in the mid-1960s. Notable literary figures of the modern era include Multatuli, Chairil Anwar, Mohammad Yamin, Merari Siregar, Marah Roesli, Pramoedya Ananta Toer, and Ayu Utami.