More American films:

The Chamber
In Cold Blood

If we don't limit ourselves to American films, there's also:

Modern:
Dance with a Stranger (last woman executed in England)
Kieslowski's Decalogue 5 (?) or A Short Film about Killing
Let Him Have It

Historical:
A Tale of Two Cities
Danton
-- almost any film about the French Revolution
Mary, Queen of Scots
Elizabeth
Lady Jane

Modern Historical:
Breaker Morant
Merry Christmas, Mr. Lawrence

Shari L. Rosenblum

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University of Alabama: http://www.tcf.ua.edu