She was part of the resistance against Axis forces in World War II until Nazis executed her father and her in 1943.
[3] As World War II escalated, in 1941, Ban's family home became a hub for the local partisans of the National Liberation Movement in Croatia (NOP) in their resistance against the Axis powers.
[2][3] Ban joined the League of Communist Youth of Yugoslavia (SKOJ) in February 1942 and participated in partisan activities, sewing clothes or performing courier duties.
[3] On 16 June 1943, Ban and her father were admitted to the Communist Party of Yugoslavia in a partisan base in Brgudac [hr].
[5] In 1973, Olga Ban was posthumously declared a People's Hero of Yugoslavia by President Josip Broz Tito.