The Nazis claimed jurisdiction over all collective and social activity, interfered with Catholic schooling, youth groups, workers' clubs and cultural societies. By early 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" encyclical – accusing the Nazi Government of violations of the 1933 Concordat, and further that it was sowing the "tares of suspicion, discord, hatred, calumny, of secret and open fundamental hostility to Christ and His Church". The Pope noted on the horizon the "threatening storm clouds" of religious wars of extermination over Germany.