Killer Nun (1979)

(original title: Suor Omicidi)

A demented nun sliding through morphine addiction into madness, while presiding over a regime of lesbianism, torture and death. Sister Gertrude is the head nurse/nun in a general hospital, whose increasingly psychotic behavior endangers the staff and patients around her.

Killer Nun was on the uk video nasties list but wasn't prosecuted! Released with 13 seconds cut in 1993. Re-released uncut in 2006.