Columbia subject headings:
Catholic Church--History--19th century.
Christianity and culture--History--20th century.
Violence--Religious aspects--Catholic Church.
Harvard subject headings:
Catholic Church--History--19th century.
Christianity and culture--History--20th century
Violence--Religious aspects--Catholic Church
Princeton subject headings:
Catholic Church--History--19th century.
Christianity and culture--History--20th century.
Violence--Religious aspects--Catholic Church.