At 17, he made a speech in front of striking factory workers that resulted in his being sentenced to nineteen months in prison.
He wrote his first play in 1924 and was later repeatedly imprisoned under Nazi rule in various concentration camps for spreading socialistic anti-war propaganda and being an active member of the Communist Party.
In the early 1950s, Apitz worked as a guide to the former camp, Buchenwald, and was "actively involved in the plan for the earliest expedition to be shown there in 1952.
Apitz's best selling novel Nackt unter Wölfen was first published in 1958 and then translated into over thirty languages, winning him worldwide recognition.
The logline for this edition reads as follows: "Armies drive before them the rags of Hitler's might and news trickles through to the concentration camp inmates and a child is saved."