When the war started and Bulgarian occupiers went to Veles, Blagoj was chosen as a member for the local committee of KPJ in Veles and secretary of the local committee of SKOJ.
During 1936-1937 he studied medicine at the University of Zagreb and became a member of the Students' Committee of SKOJ and a member of the Action Committee in Belgrade.
After Axis powers occupied Yugoslavia in 1941, SKOJ organized a united youth front with the program of struggle against fascism and war, Anti-Fascist Youth Committees which at the Congress of Anti-Fascist Youth of Yugoslavia in Bihać in 1942 united into the Unified League of Anti-Fascist Youth of Yugoslavia (Ujedinjeni savez antifašističke omladine Jugoslavije - USAOJ).
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SKOJ was founded in Zagreb on October 10, 1919 as a political organization of revolutionary youth the youth which followed the policy of the Socialist Workers' Party of Yugoslavia (communist).