About 4,000 Ukrainian men and some women and children of Austro-Hungarian citizenship were kept in twenty-four internment camps and related work sites – also known, at the time, as concentration camps. Many were released in 1916 to help with the mounting labour shortage. Another 80,000 were registered as "enemy aliens" and obliged to regularly report to the police. Those interned had whatever little wealth they owned confiscated and were forced to work for the profit of their gaolers.