The camp committee of the Communist Party of Croatia maintained contact with the People’s Liberation movement via the inmate doctors of the Ustasha hospital in Jasenovac village, railwaymen who brought the inmates to Camp III (Brickworks) and the villagers of the River Sava valley.

Marija Lončarević, born in Plesmo, was the president of the Anti-Fascist Women’s Front in Plesmo, and was charged with contacting inmate doctors in the Ustasha hospital. She visited the hospital regularly, carrying letters and smuggling out bandages and medicines prepared by prisoners. She was so successful that the doctors suggested putting her in a plaster cast, in which she managed to smuggle letters from the camp party committee for months.

She was arrested in December 1943 and after being tortured, was killed in Jasenovac Camp in 1944.