Manolić was born on 22 March 1920 in
Kalinovac near
Đurđevac to a well-to-do working-class family as the youngest of four children. When he was eight, his family moved to Orlovac near
Nova Rača. He graduated from the secondary Craft School in
Bjelovar, where he studied to be a shoemaker. When he was 18, he joined the
League of Communist Youth of Yugoslavia (SKOJ). He was vice president of the Association of Workers' Unions (URS) for the tanning industry. He was accepted into the
Communist Party of Croatia when he was 19. In 1940 he was appointed Secretary of the Municipal Committee of SKOJ for
Nova Gradiška and was named a member of the Regional Committee of the Communist Party. After the outbreak of the
World War II in Yugoslavia, Manolić was involved in illegal party activity in Nova Gradiška. He was arrested by the
Ustaše authorities in May 1941, along with twelve members of the Communist Party and SKOJ, for multiplying and sharing the Communist Party leaflets. At first, he was imprisoned in Nova Gradiška, but was later transferred to
Slavonska Požega. Two of the party members were sentenced to death, but were later pardoned and their sentences were reduced to two and three years in prison, respectively. The rest were released. After his release, Manolić went to
Zagreb, where he agitated for the
Yugoslav Partisans. He remained in Zagreb until October 1942, when he moved to the territory under the partisan control. As a party agitator, he traveled across Croatia. With dismissal of
Andrija Hebrang in 1944, the whole leadership of SKOJ was dismissed as well, including Manolić, who was Organisational Secretary. After his dismissal, the Party sent him to
Bjelovar. In March 1944, Manolić became Member of the Municipal Committee of the Communist Party of Croatia for Bjelovar, and was later named Organisational Secretary. In October 1944, he was named Director of
OZNA 2 in Bjelovar, the communist police founded in May 1944. OZNA 2's jurisdiction were internal affairs, while OZNA 1's jurisdiction was external security and OZNA 3 served within the military. Under pressure from the
Armed Forces of the Independent State of Croatia, the Yugoslav Partisans left Bjelovar, and returned again on 5 May 1945. His duty, from that point on, was, as Manolić said, to "clear the terrain from the remaining Ustaše and adversary occupational forces". His jurisdiction was Municipality of Bjelovar, which then included
Koprivnica,
Križevci,
Đurđevac,
Vrbovec,
Čazma and
Ivanić-Grad. == Communist era ==