Prisoners
The first inmates imprisoned on 2 September 1939 were 150 Polish citizens, arrested on the streets of Danzig right after the outbreak of the war. The inmate population rose to 6,000 in the following two weeks, on 15 September 1939.
Tens of thousands of people, perhaps as many as 110,000, were deported to the Stutthof camp. The prisoners were mainly non-Jewish Poles. There were also Polish Jews from Warsaw and Białystok, and Jews from forced-labor camps in the occupied Baltic states, which the Germans evacuated in 1944 as Soviet forces approached. These totals are thought to be conservative, as it is believed that inmates sent for immediate execution were not registered.
When the Soviet army began its advance through Nazi-occupied Estonia in July and August 1944, the camp staff of Klooga concentration camp evacuated the majority of the inmates by sea to the Stutthof concentration camp.
*source: wikipedia.org