Catholic extermination camps
Surprisingly few know that Nazi extermination camps in World War II were by no means the only ones in Europe at the time. In the years 1942-1943 also in Croatia existed numerous extermination camps, run by Catholic Ustasha under their dictator Ante Paveliç, a practicing Catholic and regular visitor to the then pope. There were even concentration camps exclusively for children!
In these camps - the most notorious was Jasenovac, headed by a Franciscan friar - orthodox-Christian Serbians (and a substantial number of Jews) were murdered. Like the Nazis the Catholic Ustasha burned their victims in kilns, alive (the Nazis were decent enough to have their victims gassed first). But most of the victims were simply stabbed, slain or shot to death, the number of them being estimated between 300,000 and 600,000, in a rather tiny country. Many of the killers were Franciscan friars. The atrocities were appalling enough to induce bystanders of the Nazi "Sicherheitsdienst der SS", watching, to complain about them to Hitler (who did not listen). The pope knew about these events and did nothing to prevent them.