After the premature re-election of presbyters and
synodals on 23 July 1933, which
Adolf Hitler had discretionarily imposed onto all Protestant
church bodies in Germany (see
Evangelical Church of the old-Prussian Union), the Nazi partisan Protestant so-called
Faith Movement of German Christians, founded by Kube among others, gained a majority in the presbytery of the
Kaulsdorf Congregation, like in most congregations within the
Evangelical Church of the old-Prussian Union. With the new majorities on all levels of church organisation the
German Christians systematically tried to subject any unadulterated form of Protestantism by way of firing church employees of other opinion, blocking church property for non-Nazi Protestant groups, and prohibiting collections for other purposes than the officially approved ones. On 2 February 1934, the presbytery of the
Supreme Parish and Collegiate Church appointed the
Reformed Heinrich Grüber as the new pastor of the Kaulsdorf congregation, since this church still held the
ius patronatus of the Kaulsdorf Church. Grüber, before pastor at the diaconal foundation
Stephanus-Stiftung Waldhof in
Templin and known as member of the Nazi opposing
Emergency Covenant of Pastors (), was strictly rejected by the
German Christian-dominated Kaulsdorf presbytery. But the
March of Brandenburg ecclesiastical provincial consistory (the competent bureaucracy within the old-Prussian Church) insisted on his appointment as decided by the presbytery of the
Supreme Parish and Collegiate Church. The office of pastor included the function as executive-in-chief of the presbytery. Thus conflicts were unavoidable. The German Christian presbyters steadily denounced Grüber within the ecclesiastical bureaucracy for criticising
Ludwig Müller, the then old-Prussian state bishop (), and the Nazi party local group leader denounced him at the
Gestapo, for criticising the Nazi sterilisation laws (see
Nazi Eugenics) and for mercy and sympathy with the Jews. Prior to Grüber's appointment, the few congregants in Kaulsdorf opposing the Nazi interference and adulteration of Protestantism did not organise as a group. Now Grüber built up a
Confessing Church congregation at Jesus Church. As the officially appointed pastor Grüber held the regular services in Jesus Church, preaching against the
Cult of personality of Hitler, the armament of Germany, and
anti-Semitism. However, other events, such as collections of money for purposes of the Confessing Church, meetings of its adherents or elections of their
brethren council, paralleling the
German Christian-dominated presbytery, were forbidden to take place as events open for the public, but only card-carrying members were allowed. Grüber carried the – due to their colour so-called –
Red Card No. 4, issued on 22 December 1934 by the Confessing congregation of Kaulsdorf. The information about Grüber's appointment spread among the adherents of the Confessing Church in neighbouring congregations comprising the competent deanery
Berlin Land I, such as Ahrensfelde, Biesdorf, Blumberg, Fredersdorf, Friedrichsfelde, Heinersdorf,
Hohenschönhausen, Karlshorst, Klein-Schönebeck, Lichtenberg, Mahlsdorf, Marzahn, Neuenhagen, Petershagen, or Weißensee mostly without a local pastor supporting them. They started to travel for Sunday services to Jesus Church. Grüber encouraged them to establish Confessing congregations of their own and attended, e.g., the formal foundation of Friedrichsfelde Confessing congregation on 1 February 1935. Grüber presided over the Confessing synod of the deanery
Berlin Land I, constituted from Confessing synodals from the pertaining congregations on 3 March 1935. The Confessing congregants in Kaulsdorf's congregation became a great support for Grüber. He also provided for Confessing pastors, who would act in his place once he could not hold the service himself. In August 1935, his colleague Pastor Neumann from
Köpenick preached instead of him, criticising the anti-Semitic policy of the German government, which earned him a denunciation by the presbytery.
German Christian presbyters denounced Grüber again for his opposing attitudes at the
March of Brandenburg provincial
consistory and the Gestapo. The NSDAP local party leader (Ortsgruppenleiter) threatened to prompt Gruber's deportation to a
concentration camp. The mainstream Nazi anti-Semitism considered the Jewry as a group of people bound by close, so-called genetic (blood) ties, to form a unit, which one could not join or secede from. The influence of Jews was declared to have a detrimental impact on Germany, so as to justify the discrimination and persecution of Jews. To be spared from that, one had to prove one's affiliation with the group of the so-called
Aryan race. It was paradoxical that genetic tests or outward racial features never determined one's affiliation, although the Nazis palavered a lot about physiognomy, but only the records of religious affiliations of one's grandparents decided. However, while the grandparents were earlier still able to choose their religion, their grandchildren in the Nazi era were compulsorily categorised as Jews, if at least three of the four grandparents were enrolled as members of a Jewish congregation. This Nazi categorisation as Jews of course included mostly Jews of Jewish descent, but also many Gentiles of Jewish descent, such as Catholics,
irreligionists, and Protestants, who happened to have had grandparents belonging – according to the records – to a Jewish congregation. While Jewish congregations in Germany tried – little as they were allowed – to help their persecuted members, the Protestant church bodies failed to assist their parishioners who were classified as Jews (according to the
Nuremberg Laws) and the somewhat less persecuted
Mischlinge of partially Jewish descent. On 31 January 1936 the
International Church Relief Commission for German Refugees was founded in London, but its German counterpart never materialised. So
Bishop George Bell got his sister-in-law Laura Livingstone to run an office for the international relief commission in Berlin. The failure of the
Confessing Church was evident, even though 70–80% of the Christian Germans of Jewish descent were Protestants. It was Grüber and some enthusiasts who started a new effort in 1936. They forced the ''Confessing Church's
hand, which in 1938 supported the new organisation, named by the Gestapo Bureau Grüber
(), but after its official recognition Relief Centre for Evangelical Non-Aryans''. During the night of 9 November 1938 the Nazi government organised the
November Pogrom, often emphasised as
Kristallnacht. The well-organised Nazi squads killed several hundreds and 1,200 Jewish Berliners were deported to
Sachsenhausen concentration camp. Many men went into hiding from arrest and also appeared at Grüber's home in the
rectory of the Jesus Church. He organised their hiding in the cottages in the
allotment clubs in his parish. The Nazis only released the arrested inmates if they would immediately emigrate. Thus getting a visa became the main target and problem of Grüber's Bureau. Grüber was allowed to travel several times to the Netherlands and Great Britain in order to persuade the authorities there to grant visas for those persecuted in Germany. So Grüber hardly found time any more to serve at his actual office as pastor in Kaulsdorf. Eichmann asked Grüber in a meeting about Jewish emigration why Grüber, not having any Jewish family and with no prospect for any thanks, helps the Jews. Grüber answered because the
Good Samaritan did so, and my Lord told me to do so. By autumn 1939 a new degree of persecution loomed. The Nazi authorities started to deport Jewish Austrians and Gentile Austrians of Jewish descent to
occupied Poland. On 13 February 1940 the same fate hit 1,200 Jewish Germans and Gentile Germans of Jewish descent from
Stettin, who were deported to
Lublin. Grüber learned about it by the
Wehrmacht commander of Lublin and then protested to every higher ranking superior up to the then Prussian Minister-President
Hermann Göring, who forbade further deportations from Prussia for the time being. The Gestapo warned Grüber never to show support for the deported again. The deported were not allowed to return. On 22–23 October 1940, 6,500 Jewish Germans and Gentile Germans of Jewish descent from
Baden and the
Palatinate were deported to
Gurs,
occupied France. Now Grüber got himself a passport, with the help of
Dietrich Bonhoeffer's brother-in-law
Hans von Dohnanyi from the
Abwehr, to visit the deported in the
Gurs (concentration camp). But before he left the Gestapo arrested Grüber on 19 December and deported him two days later to Sachsenhausen concentration camp, and in 1941 to
Dachau concentration camp where he became inmate No. 27832. Grüber survived Dachau and built up good relations with many other inmates, among them also communists. He was released from Dachau to his wife Margarete, née Vits, and their three children Ingeborg, Hans-Rolf, and Ernst-Hartmut in Kaulsdorf on 23 June 1943, after he signed an agreement not to help the persecuted any more. Grüber then resumed his office as pastor of Kaulsdorf and the Confessing Church in the
Berlin Land I deanery. He reported in the Confessing congregations of the deanery about the truth in a concentration camp, such as Dachau and Sachsenhausen. The church weathered the Second World War rather intact, but at the end of the war the spire was shot down by artillery fire. On 22 April 1945 at the invasion of the
Red Army into the Kaulsdorf neighbourhood, Grüber gathered some undaunted Kaulsdorfers to follow him with white flags to march in the direction of the Soviet soldiers in order to avoid further bloodshed. ==After the war==