the Legion destroyed the city of Guernica in 1937. The number of women in paid employment only increased by 271,000 (1.8 percent) from 1939 to 1944. Nazi Germany made increasingly aggressive territorial demands, threatening war if these were not met. Several Catholic leaders were targeted in the 1934 Night of the Long Knives assassinations. From 1934, university students were required to attend frequent and time-consuming military training sessions run by the. Belgian Eupen-Malmedy, which had been part of Germany until 1919, was annexed. Areas placed under German administration included the Protectorate of Bohemia and Moravia, Reichskommissariat Ostland (encompassing the Baltic states and Belarus and Reichskommissariat Ukraine. The Red Orchestra spy ring provided information to the Allies about Nazi war crimes, helped orchestrate escapes from Germany, and distributed leaflets. Most teachers were required to belong to the Nationalsozialistischer Lehrerbund (nslb; National Socialist Teachers League) and university professors were required to join the National Socialist German Lecturers. Initially a small bodyguard unit under the auspices of the SA, the Schutzstaffel (SS; Protection Squadron) grew to become one of the largest and most powerful groups in Nazi Germany.