The first communist groups in Zagreb based on the principles of the Russian Bolsheviks were formed already in December. During this time, Ćopić collaborated with left-wing artists August Cesarec and Miroslav Krleža, as well as later leading party members Simo Miljuš and Đuro Cvijić. Members of the group dispersed to their hometowns to form chapters throughout the region.
The initial communist organizations in Zagreb based on the tenets of the Russian Bolsheviks were established as early as December. During this period, Ćopić collaborated with left-wing artists August Cesarec and Miroslav Krleža, alongside later party leaders Simo Miljuš and Đuro Cvijić. Members of the group dispersed to their hometowns to establish chapters throughout the area.