In September 1891 he enrolled in law at the University of Zagreb.[5] He was selected as a representative of the student body at the celebration of the 300th anniversary of the Battle of Sisak in 1893. After criticizing the ban of Croatia Károly Khuen-Héderváry during the ceremony and referring to him as a "Magyar hussar", Radić was sentenced to four months in prison which he served in Petrinja.[5] He was among a group of students who set fire to the Hungarian tricolour on 16 October 1895 during the visit of Emperor Franz Joseph to Zagreb.