"We'll give 'em a fair trial before we hang 'em."
Lol, I don't even remember what that line is from...
I heard it as “we’re gonna give you a right fair trial, followed by a first-class hangin’.” It’s from a western, but I can’t recall which one, either.
Apparently well before that...
The Westerner with Gary Cooper (1940):
In comes Gary Cooper, who has been arrested for stealing a horse. Brennan assures him that "we give horse thieves a fair trial before we hang them."
https://gogorama.blogspot.com/2018/03/the-westerner.html
Yeppers...
...that's one of of those comments that have been used numerous times in the past, and likely always in westerns. I think John Wayne even said something similar in "Rooster Cogburn."