Minister for Propaganda, led the Nazi persecution of the Catholic clergy and wrote that there was "an insoluble opposition between the Christian and a heroic-German world view". Hitler's chosen deputy, Martin Bormann, was a rigid guardian of Nazi orthodoxy and saw Christianity and Nazism as "incompatible", as did the official Nazi philosopher, Alfred Rosenberg, who wrote in Myth of the Twentieth Century (1930) that the Catholic Church were among the chief enemies of the Germans. In 1934, the Sanctum Officium put Rosenberg's book on the Index Librorum Prohibitorum (forbidden books list of the Church) for scorning and rejecting "all dogmas of the Catholic Church, indeed the very fundamentals of the Christian religion". The Nazis claimed that they had jurisdiction over all collective and social activities and based on their claim, they infiltrated all collective and social institutions, interfered in all of the activities which they performed, and banned them if they did not become Nazified, including Catholic schools, youth groups, workers' clubs and cultural societies. Hitler moved quickly to eliminate Political Catholicism, rounding up members of the Catholic aligned Bavarian People's Party and Catholic Centre Party, which ceased to exist in early July 1933. Vice Chancellor Papen meanwhile, amid continuing molestation of Catholic clergy and organisations, negotiated a Reich concordat with the Holy See, which prohibited clergy from participating in politics. Hitler then proceeded to close all Catholic institutions whose functions were not strictly religious: Almost immediately after agreeing the Concordat, the Nazis promulgated their sterilization law, an offensive policy in the eyes of the Catholic Church and moved to dissolve the Catholic Youth League. Clergy, nuns and lay leaders began to be targeted, leading to thousands of arrests over the ensuing years, often on trumped up charges of currency smuggling or "immorality". In Hitler's Night of the Long Knives purge, Erich Klausener, the head of Catholic Action, was assassinated. Adalbert Probst, national director of the Catholic Youth Sports Association, Fritz Gerlich, editor of Munich's Catholic weekly and Edgar Jung, one of the authors of the Marburg speech, were among the other Catholic opposition figures killed in the purge. By 1937, the Church hierarchy in Germany, which had initially attempted to co-operate with the new government, had become highly disillusioned. In March, Pope Pius XI issued the Mit brennender Sorge encyclicalaccusing the Nazis of violations of the Concordat, and of sowing the "tares of suspicion, discord, hatred, calumny, of secret