Act of Violence (1949)

Directed by Fred Zinnemann. Robert Ryan, Van Heflin. Cinematography by Robert Surtees.

http://www.tcm.com/this-month/article/85841%7C0/Act-of-Violence.html

http://sensesofcinema.com/2000/cteq/violence/

http://www.eddiemuller.com/top25noir.html

#17 ACT OF VIOLENCE

MGM, 1949.
It directly confronts lingering WWII nightmares, mixes up the “good” guy versus “bad” guy premise to stunning effect, is beautifully directed and shot, and features great work from the four leads. Damn near perfect.

https://en.wikipedia.org/wiki/Act_of_Violence

https://www.imdb.com/title/tt0041088/