Austrian Concentration Camp workers

Check here for part of the answer
THE CAMP SYSTEM IN AUSTRIA

The Mauthausen concentration camp was established in the summer of 1938, after the German incorporation of Austria. Mauthausen became the main Nazi camp in Austria. It was built near an abandoned stone quarry, along the Danube River, about 12.5 miles southeast of Linz. The Germans designated the Mauthausen concentration camp a category III camp, indicating that it was a special penal camp with a harsh regimen. Inmates in the punishment detail, for example, were forced to carry heavy stone blocks up 186 steps from the camp quarry. The steps became known as the "Stairway of Death."
During the war, forced labor using concentration camp prisoners became increasingly important to German armaments production. In the summer and fall of 1944, subcamps under the administration of Mauthausen were established near armaments factories throughout northern Austria. The staff at Mauthausen administered more than 60 subcamps, including Gusen, Gunskirchen, Melk, Ebensee, and Amstetten. Thousands of prisoners were worked to death.
In addition to Mauthausen and its subcamps, other camps in Austria extended from Lochau in the west to Strasshof in the east.
Austria

You might also check this site for more information
The Camps