When World War II broke out in Yugoslavia in 1941, Redžić was in his 20s. He actively participated in NOB from 1941–45 and was also a councilor on the State Anti-fascist Council for the National Liberation of Bosnia and Herzegovina and the Anti-Fascist Council for the National Liberation of Yugoslavia. He was secretary and vice president of the District People's Liberation Committee over from 1944 to 1945 in Bihać.