caused by failings in the economy, government intrusions into private life, disruption of accepted tradition and custom, and police-state controls." Otto and Elise Hampel protested the regime by leaving postcards urging resistance (both passive and forceful) against the regime around Berlin. It took two years before they were caught, convicted and then put to death. Opposition based on this widespread dissatisfaction usually took "passive" forms—absenteeism, malingering, spreading rumours, trading on the black market, hoarding, avoiding various forms of state service such as donations to Nazi causes. But sometimes it took more active forms, such as warning people about to be arrested, hiding them or helping them to escape, or turning a blind eye to oppositionist activities. Among the industrial working class, where the underground SPD and KPD networks were always active, there were frequent if short-lived strikes. These were generally tolerated, at least before the outbreak of war, provided the demands of the strikers were purely economic and not political. Another form of resistance was assisting the persecuted German Jews. By mid-1942 the deportation of German and Austrian Jews to the extermination camps in occupied Poland was well under way. It is argued by some writers that the great majority of Germans were indifferent to the fate of the Jews, and a substantial proportion actively supported the Nazi programme of extermination. But a minority persisted in trying to help Jews, even in the face of serious risk to themselves and their families. This was most pronounced in Berlin, where the Gestapo and SS were headquartered, but also where thousands of non-Jewish Berliners, some with powerful connections, risked hiding their Jewish neighbors. Aristocrats such as Maria von Maltzan and Maria Therese von Hammerstein obtained papers for Jews and helped many to escape from Germany. In Wieblingen in Baden, Elisabeth von Thadden, a private girls' school principal, disregarded official edicts and continued to enroll Jewish girls at her school until May 1941 when the school was nationalised and she was dismissed (she was executed in 1944, following the Frau Solf Tea Party). A Berlin Protestant Minister, Heinrich Grüber, organised the smuggling of Jews to the Netherlands. At the Foreign Office, Canaris conspired to send a number of Jews to Switzerland under various pretexts. It is estimated that 2,000 Jews were hidden in Berlin until the end of the war. Martin Gilbert has documented numerous cases of Germans and Austrians, including officials and