belonged to the Slovak nation, was confiscated by the Prime Minister's office, with the justification that, according to Hungarian laws, there did not exist a Slovak nation. 1874–1892 – Slovak children were being forcefully moved into "pure Magyar districts". Between 1887 and 1888 about 500 Slovak orphans were transferred by FEMKE. 1883 – The Upper Hungary Magyar Educational Society, (Hungarian name of the NGO was FEMKE ), was created. The society was founded to propagate Magyar values and Magyar education in Upper Hungary. 1897 – The Bánffy law of the villages is ratified. According to this law, all officially used village names in the Hungarian Kingdom had to be in Hungarian language. 1898 – Simon Telkes publishes the book "How to Magyarize family names". 1907 – The Apponyi educational law made Hungarian a compulsory subject in all schools in the Kingdom of Hungary. This also extended to confessional and communal schools, which had the right to provide instruction in a minority language as well. "All pupils regardless of their native language must be able to express their thoughts in Hungarian both in spoken and in written form at the end of fourth grade [~ at the age of 10 or 11]" 1907 – The Černová massacre in present-day northern Slovakia, a controversial event in which 15 people were killed during a clash between a group of gendarmes and local villagers. After Trianon A considerable number of other nationalities remained within the frontiers of the post-Trianon Hungary: According to the 1920 census 10.4% of the population spoke one of the minority languages as their mother language: 551,212 German (6.9%) 141,882 Slovak (1.8%) 23,760 Romanian (0.3%) 36,858 Croatian (0.5%) 23,228 Bunjevac and Šokci (0.3%) 17,131 Serb (0.2%) The number of bilingual people was much higher, for example 1,398,729 people spoke German (17%) 399,176 people spoke Slovak (5%) 179,928 people spoke Croatian (2.2%) 88,828 people spoke Romanian (1.1%). Hungarian was spoken by 96% of the total population and was the mother language of 89%. In interwar period, Hungary expanded its university system so the administrators could be produced to carry out the Magyarization of the lost territories for the case they were regained. In this period the Roman Catholic clerics dwelled on Magyarization in the school system even more strongly than did the civil service. The percentage and the absolute number of all non-Hungarian nationalities decreased in the next decades, although the total