Avraham was born in Pinsk in 1918 to Israel and Anna Sackler, and was named Yehuda. In his grandfather’s house, he was inculcated with Zionism and joined Beitar. He studied in the Oort School. Between 1937 and 1939, a group of Beitar members came together to make aliyah. World War II broke out in the meantime, and only in 1939 were they able to cross the border to Lithuania, and from there, in many ways, over the course of months to make their way to the Land of Israel. They used forged documents to travel through Syria and Lebanon; since Yehuda Sackler arrived in the Land of Israel with the name “Avraham Lieberman,” this remained the case.

Upon his arrival, he and his fellow travelers were arrested and sent to Atlit, where they remained for a few weeks. After they were released, Avraham joined Lehi, living underground for eight years, until the State of Israel was established. He filled a number of important roles, including being in charge of communications and security for Yitzhak “Michael” Shamir. He dug armories and built weapons caches on the property of supporters he recruited for the underground, including the courtyard of the Hazon Ish and Rabbi Kahaneman. He acquired documentation and arranged it for underground members sought by the CID, and beyond all that also took part in operations such as seizing cash and merchandise from speculators and the attempt to assassinate High Commissioner of Palestine Sir Harold MacMichael.

In the underground, he met Rivka “Karni” Tick, daughter of some of the founders of Bnei Brak, who reached the underground from Brit Hashmona’im. They married and had three children, Arnon, Anat and Gideon, as well as numerous grandchildren.

Avraham had a deep, warm relationship with the national poet Uri Tzvi Greenberg, until the latter’s death. In 1953, Avraham was arrested as part of what was known as the Tzrifin Underground. He was only freed after a seventeen-day hunger strike.

During his time in the underground, and for years afterward, he gathered notes, letters, posters, certificates and other documents; he also recorded interviews with various comrades. This material, lovingly gathered over the course of years, formed the core of the Lehi Archive.

As a civilian, Avraham worked as a bookbinder. As time passed, he worked in the Srigim metal factor, finally finding a position at Civil Intelligence, where he worked until he retired.