Indonesian students were also present at the pacifist Congrès Democratique International in August 1926 in the French town of Bierville, and at several meetings of the League against Imperialism from February 1927 onwards. Mohammad Hatta, who was the chair and most important of the Indonesian students, was appointed in the Executive Committee of the LAI, and thus acquired much prominence and an extensive international network. Troubled by the foreign activities of the Perhimpoenan Indonesia and the contacts with the communist Comintern, the Dutch authorities decided to crack down on the students in 1927, and to charge the students with sedition in Indonesia Merdeka. On 10 June 1927 house raids took place in Leiden and The Hague, in which large quantities of documents were seized. On 23 September, Mohammad Hatta, Ali Sastroamidjojo, Abdoelmadjid Djojoadhiningrat and Nazir Pamontjak were arrested and put under charge. The court case, which took place in March 1928, led to the release of all the students. The PI and Hatta gained much publicity in the Netherlands and the Netherlands Indies. The brochure "Indonesia Free" which Hatta wrote in jail became a widely read document among Indonesian nationalists. Nonetheless, the confrontation with the authorities also implied that many of the most active students refrained from further activities, and that the membership of the PI dwindled. Largely inactive, the leadership of the association was finally taken up by a group of communist Indonesian students under Abdulmadjid Djojoadhiningrat. Prominent nationalists, among whom Hatta and Sjahrir, were expelled from the association, and de facto the PI changed into a front organization of the Communist Party of the Netherlands. In 1933 the PI-chair Roestam Effendi was elected as the first Indonesian in the Dutch Parliament as part of the CPH. During the Second World War between 60 and 110 PI-members participated in the resistance against fascism.