The Priest Barracks of Dachau Concentration (in German Pfarrerblock, or Priesterblock) incarcerated clergy who had opposed the Nazi regime of Adolf Hitler. From December 1940, Berlin ordered the transfer of clerical prisoners held at other camps, and Dachau became the centre for imprisonment of clergymen. Of a total of 2,720 clerics recorded as imprisoned at Dachau some 2,579 (or 94.88%) were Roman Catholics. Among the other denominations, there were 109 Protestants, 22 Greek Orthodox, 8 Old Catholics and Mariavites and 2 Muslims. Members of the Catholic Society of Jesus (Jesuits) were the largest group among the incarcerated clergy at Dachau.
Dachau was established in March 1933 as the first Nazi Concentration Camp. Dachau was chiefly a political camp, rather than an extermination camp, but of around 160,000 prisoners sent to its main camp, over of 32,000 were either executed or died of disease, malnutrition or brutalization. The prisoners of Dachau were used as guinea pigs in Nazi medical experiments. The sick were sent to Hartheim to be euthanized.
Along with priests, other political prisoners including Social Democrats and Communists, Jews, Gypsies, Jehovah's Witnesses and homosexuals were also incarcerated at Dachau.
Prior to the Reichstag vote for the Enabling Act under which Hitler gained the "temporary" dictatorial powers with which he went on to permanently dismantle the Weimar Republic, Hitler promised the Reichstag on 23 March 1933, that he would not interfere with the rights of the churches. However, with power secured in Germany, Hitler quickly broke this promise. He divided the Lutheran Church (Germany's main Protestant denomination) and instigated a brutal persecution of the Jehovah's Witnesses. He dishonoured a Concordat signed with the Vatican and permitted a persecution of the Catholic Church in Germany. The long term plan was to "de-Christianise Germany after the final victory". The Nazis co-opted the term Gleichschaltung to mean conformity and subservience to the National Socialist German Workers' Party line: "there was to be no law but Hitler, and ultimately no god but Hitler". Within a short period, the Nazi government's conflict with the churches had become a source of great bitterness in Germany.