Republican leaders struggled to come to terms with popular sentiment; some wanted passionate armed struggle; others a more reasoned approach. Some leaders, such as the leftist Tan Malaka, spread the idea that this was a revolutionary struggle to be led and won by the Indonesian "pemuda". Sukarno and Hatta, in contrast, were more interested in planning out a government and institutions to achieve independence through diplomacy. Pro-revolution demonstrations took place in large cities, including one in Jakarta on 19 September with over 200,000 people, which Sukarno and Hatta, fearing violence, successfully quelled.