After the German-Soviet war began, the Nazis decided to undertake the European-wide Final Solution to the Jewish Question. In January 1942, during a secret meeting of German leaders chaired by Reinhard Heydrich, Operation Reinhard was drafted; soon to become a major step in the systematic murder of the Jews in occupied Europe, beginning in the General Government district of German-occupied Poland. Within months, three top-secret camps (at Bełżec, Sobibór, and Treblinka) were built to efficiently kill tens of thousands of Jews every day.