When Buchenwald first opened in 1937 it housed only men; women were not added until late 1943. It was known for keeping political prisoners, such as German and Russian communists. Buchenwald did not solely invest in it's encampment to Jews. The camp imprisoned recidivist criminals, Jehovah's witnesses, roma and sinti (also known as Gypsies), and resistance fighters. The camp also held German military deserters, former government officials of German occupied country, and foreign forced laborers. By February 1945 it held 112,000 people. It is estimated that from July 1937 to March 1945 over 230,000 prisoners passed through from 30 different countries. Of all the prisoners held in Buchenwald 56,000 were murdered in the camp system (ushmm Buchenwald and Jewish Library).