The Vatican had music which was forbidden to be copied and was only played twice per year. The piece was kept secret for almost 150 years until a 14 year old Mozart listened to it and transcribed it from memory.
In 1605, the Papal Conclave had the first and only recorded injury. The Cardinals had a fight over nominees for pope, so loud that onlookers outside the palace could hear them brawling, and one Cardinal ended up with several broken bones.
“Mit brennender Sorge” or “With Burning Concern” was a papal letter secretly smuggled into Germany and read from every Catholic pulpit on Palm Sunday, 1937. The letter was written in German, not the usual Latin, so everyone could understand. It condemned the Reich Government. It implied that everyone in Heaven was laughing at Hitler, a “prophet of nothingness”. It denounced the exaltation of one race or blood over another, ie racism.
The day after “Mit Brennender Sorge,” the Gestapo raided the churches to confiscate all the copies they could find, and the presses that had printed the letter were closed.