 In 1938 , an elementary school opened in Kamenica at which Velimir Stojnić was a trainee teacher . Stojnić , a member of the Communist Party of Yugoslavia ( Serbo @-@ Croatian : Komunistička partija Jugoslavije or KPJ , outlawed since 1921 ) , organised a public library , reading and sports clubs and a cultural @-@ artistic group . He established a secret KPJ cell in Kamenica in 1939 , the first communist organisation in the area . His ideological convictions earned him a following among the village youth , including Marija 's brother Dušan . The authorities soon became aware of Stojnić 's activities , and he was removed from Kamenica in February 1940 . 
