"An Ostarbeiter was an 'Eastern Worker', rounded up by Nazi Germany from the captured territories in Central and Eastern Europe. By the end of the war, it is estimated that approximately 3 million to 5.5. million Ostarbeiter were forced to work in guarded work camps, many of them younger than 16 years old - at which age they would be conscripted for military service. Ostarbeiter worked 12 hours a day on starvation on rations; as ethnic Slavs, they were treated with extraordinary brutality by Nazi guards who considered them 'sub-human' by the standards of the Aryan master race. They were distinguished by the label 'OST' sewn onto their uniforms." --Amazon.com.