Columbia subject headings:
Catholic Church--History--20th century.
Catholics--Biography.
Christian martyrs--Biography.
Christian martyrs--History--20th century.
Persecution--History--20th century.
Harvard subject headings:
Catholic Church--History--20th century.
Christian martyrs--History--20th century.
Princeton subject headings:
Catholic Church--History--20th century.
Christian martyrs--Biography.
Christian martyrs--History--20th century.
Persecution--History--20th century.