of the African nationalist parties, the MNC had many different factions within it that took differing stances on a number of issues. It was increasingly polarised between moderate évolués and the more radical mass membership. A radical faction headed by Iléo and Albert Kalonji split away in July 1959, but failed to induce mass defections by other MNC members. The dissident faction became known as the MNC-Kalonji (MNC-K), while the majority group became the MNC-Lumumba (MNC-L). The split divided the party's support base into those who remained with Lumumba, chiefly in the Stanleyville region in the north-east, and those who backed the MNC-K, which became most popular around the southern city of Élisabethville and among the Luba ethnic group. Major riots broke out in Léopoldville, the Congolese capital, on 4 January 1959 after a political demonstration turned violent. The Force Publique, the colonial gendarmerie, used force against the rioters—at least 49 people were killed, and total casualties may have been as high as 500. The nationalist parties' influence expanded outside the major cities for the first time, and nationalist demonstrations and riots became a regular occurrence over the next year, bringing large numbers of black people from outside the évolué class into the independence movement. Many blacks began to test the boundaries of the colonial system by refusing to pay taxes or abide by minor colonial regulations. The bulk of the ABAKO leadership was arrested, leaving the MNC in an advantageous position. These developments led to the white community also becoming increasing radicalised. Some whites planned to attempt a coup d'état if a black majority government took power. As law and order began to break down, white civilians formed militia groups known as Corps de Voluntaires Européens ("European Volunteer Corps") to police their neighbourhoods. These militias frequently attacked the black population. Independence In the fallout from the Léopoldville riots, the report of a Belgian parliamentary working group on the future of the Congo was published in which a strong demand for "internal autonomy" was noted. August de Schryver, the Minister of the Colonies, launched a high-profile Round Table Conference in Brussels in January 1960, with the leaders of all the major Congolese parties in attendance. Lumumba, who had been arrested following riots in Stanleyville, was released in the run-up to the conference and headed the MNC-L delegation. The Belgian government had hoped for a period of at least 30 years