[1] As a prisoner after the war, he wrote a historically valuable account of the camp's operation, dubbed the Broad Report.

Detached on duty to Auschwitz, he requested a transfer to the Politische Abteilung, where he conducted interrogations.

[2] He remained in Auschwitz until the dissolution of the camp in early 1945, and was captured by British armed forces.

He was arrested again in November 1964 as a defendant in the Frankfurt Auschwitz Trials, where he was found guilty of supervising selections at Birkenau, as well as participating in interrogations, tortures and executions.

In 1979 in Wuppertal, Broad was among those interviewed and secretly filmed by Claude Lanzmann for Shoah, his Holocaust documentary released in 1985.