to conform to German requirements. As a result, the district () subdivision (which had existed in the Kingdom of the Serbs, Croats and Slovenes prior to the formation of the banovinas) was restored. The Nedić government issued a decree on 23 December 1941 by which Serbia was divided into 14 districts () and 101 municipalities (). The District of Veliki Bečkerek (also known as The Banat) was theoretically part of Serbia, but became an autonomous district, run by the members of local ethnic German population. On 27 December 1941, the heads of the districts were appointed and met with Milan Nedić, Milan Aćimović, Tanasije Dinić, and Cvetan Đorđević. Racial persecution Racial laws were introduced in all occupied territories with immediate effects on Jews and Roma people, as well as causing the imprisonment of those opposed to Nazism. Several concentration camps were formed in Serbia and at the 1942 Anti-Freemason Exhibition in Belgrade the city was pronounced to be free of Jews (Judenfrei). On 1 April 1942, a Serbian Gestapo was formed. An estimated 120,000 people were interned in Nazi-run concentration camps in the occupied territory between 1941 and 1944. 50,000 to 80,000 were killed during this period. The Banjica Concentration Camp was jointly run by the German Army and Nedic's regime. Serbia became the second country in Europe, following Estonia, to be proclaimed Judenfrei (free of Jews). Approximately 14,500 Serbian Jews – 90 percent of Serbia's Jewish population of 16,000 – were murdered in World War II. Collaborationist armed formations forces were involved, either directly or indirectly, in the mass killings of Jews, Roma and those Serbs who sided with any anti-German resistance or were suspects of being a member of such. These forces were also responsible for the killings of many Croats and Muslims; some Croats who took refuge in the occupied territory were not discriminated against. After the war, the Serbian involvement in many of these events and the issue of Serbian collaboration were subject to historical revisionism by Serbian leaders. The following were the concentration camps established in the occupied territory: Banjica concentration camp (Belgrade) Crveni krst concentration camp (Niš) Topovske Šupe (Belgrade) Šabac concentration camp List of ministers President of the Council of Ministers Minister of Internal Affairs Minister of Construction Minister of Postal and Telegraph Affairs Minister of the Presidency Council Minister of Education Minister of Finance Minister of Labor Minister of Justice Minister of