Despite working with the Young Ottomans to promulgate a constitution, Abdulhamid II had dissolved the parliament by 1878 and returned to an absolutist regime, marked by extensive use of secret police to silence dissent, and by massacres committed against minorities. Constitutionalist opponents of his regime, most prominently Prince Sabahaddin and Ahmet Rıza, among other intellectuals, came to be known as Young Turks. Despite the name, Young Turks included many Arabs, Albanians, Jews, and initially, Armenians and Greeks. To organize the opposition, progressive medical students Ibrahim Temo, Abdullah Cevdet and others formed a secret organization named the Committee of Ottoman Union (later Committee of Union and Progress - CUP), which grew in size and included exiles, civil servants, and army officers. Finally, in 1908 in the Young Turk Revolution, pro-CUP officers marched on Istanbul, forcing Abdulhamid to restore the constitution. An attempted countercoup resulted in his deposition.