Avraham was an underground activist. In 1943 he traveled to Kolozsvár on a mission for the movement in order to warn the local Jews of what lay in store for them. In Kolozsvár he met with Ernø Marton, the editor of the Hungarian Jewish newspaper “Új Kelet”, with the town’s chief Rabbi, Weinberger, and with Ari Mendel and other members of the movement. Together they got organized and reached the conclusion that it was impossible to organize armed resistance and that they had to concentrate on rescue operations. From Kolozsvár Avraham traveled to Dés on a similar mission. He returned to Budapest and was enlisted in a forced labor unit where he served until October 1944. From that date he integrated his movement’s underground activities.
From his hiding place in a bunker in Hűvösvölgy, he delivered Swiss Protection Documents (Schutzpass), while taking part in editing the Underground newsletter, distributed among the Jews of Budapest. The bunker has been discovered, and Avraham was captured, imprisoned and tortured in the military prison on Margit Boulevard, from which he was released in a daring exploit carried out by his comrades in the Underground. After liberation, he initiated the posting of a memorial plaque for the paratrooper Hanna Szenes, on the backyard of the Dohány Street Synagogue.Involved in the field of education, Avraham Karni made aliya in 1946 and lived in a kibbutz. He passed away after a long-lasting illness.
Avraham made aliya. He resided in Ramat-Gan.