The following links represent almost the complete sum of information available about O’Flaherty on the Web. (Note: some of these sites draw heavily from the movie for their information, leading to a few inaccuracies.)
http://www.rootsweb.com/~irlker/scarlet.html
http://www.catholicireland.net/pages/index.php?nd=68&art=490
http://pearsecom.com/Ireland/irishheroes/MonsignorHugh.htm
http://www.terracetalkireland.com/profiles/hugh.htm
Brief rundown of World War Two in Italy.
http://www.spartacus.schoolnet.co.uk/2WWitaly.htm
Several interesting first-hand accounts of the Italian front in World War Two, from the BBC’s People’s War collection; browse their archives for even more:
http://www.bbc.co.uk/ww2peopleswar/stories/03/a1993403.shtml
http://www.bbc.co.uk/ww2peopleswar/stories/41/a2001141.shtml
http://www.bbc.co.uk/ww2peopleswar/stories/77/a2778177.shtml
Short article on Herbert Kappler.
http://en.wikipedia.org/w/index.php?title=Herbert_Kappler&oldid=54055904
What the Gestapo was and how it worked.
http://en.wikipedia.org/wiki/Gestapo
The Holocaust Martyrs’ and Heroes’ Remembrence Authority.
http://www.yadvashem.org.il/
An account of the Ardeatine Caves Massacre.
http://zchor.org/italy/caves.htm
From Columbia University, an article on Catholic heroes of the Holocaust; O’Flaherty is included.
http://www.columbia.edu/cu/augustine/arch/heroes.htm
Two views on Pope Pius XII and the Catholic response to the Holocaust:
http://users.binary.net/polycarp/piusxii.html
http://www.jewishvirtuallibrary.org/jsource/anti-semitism/pius.html
The Vatican’s official site.
http://www.vatican.va/
Wikipedia article on Vatican City.
http://en.wikipedia.org/wiki/Vatican_City
For anyone who’s wondering what the title “Monsignor” means.
http://www.newadvent.org/cathen/10510a.htm
Review and photos.
http://prayerfoundation.org/movies/movie_review_scarlet_and_the_black.htm
Review and synopsis.
http://www.charitysplace.com/review/scarletandblack.htm