Abraham and his family fled from Berlin to Amsterdam in October 1938. They found refuge in the Netherlands until January 28, 1943, when all the members of the Muhlbaum family, except Abraham, were deported to Westerbork. Abraham escaped over the rooftops during the round-up. He gradually established a new life as a member of a Dutch resistance group that included Joop Westerweel.
In 1944, Abraham was arrested as a member of the resistance (his Jewish identity remained hidden). He was held in several prisons and transit camps before being deported to Neuengamme on May 24, 1944. As a "Night and Fog" prisoner, he was entirely cut off from the outside world. No one knew his whereabouts, or even if he was alive. After three weeks at Neuengamme, he was transferred to the Natzweiler concentration camp near Strasbourg, and from there, to Dachau, in September 1944.
Following the liberation of Dachau on April 29, 1945, Abraham returned to the Netherlands, where he remained until immigrating to the United States in the 1950s.
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