Neither Van Heflin or Robert Ryan were ever considered matinée idols or big box office draws. But both men were consummate professionals who could cast well in a variety of roles. I think that Act Of Violence could have worked just as well if they had played each other's parts.
MGM was a studio that did not do noir films very often, but in this case with Fred Zinnemann directing they did this one very well. No cops or private eyes in this one, both men are your average American of 1948. One has done a terrible wrong to the other and the other is seeking revenge.
Heflin is a former pilot who was shot down over Germany during World War II and Ryan was his bombardier. They both did time in a POW camp where Heflin informed on escape plans that Ryan and others made. No one survived but Ryan and he now walks with a limp, courtesy of Nazi machine gunners.
In civilian life Heflin is now a very successful contractor and when he hears Ryan is looking for him, he gets naturally rattled which concerns his wife Janet Leigh. Heflin who was not going to go to a convention in Los Angeles now changes his mind abruptly, but not before explaining to Leigh the reason for his fear. It's more fear of being exposed than for his life.
In Los Angeles Heflin who won his Oscar for Johnny Eager playing an alcoholic borrows a bit from that role as he ends up in a waterfront dive pouring his troubles out to some lowlifes played by Mary Astor, Taylor Holmes, and Berry Kroeger. Holmes is also drawing a bit from a previous role as a shyster lawyer in Kiss Of Death as he's playing the same kind of character in seedier circumstances. In fact Holmes's character says he is an attorney. I know Fred Zinnemann must have seen Kiss Of Death and cast Holmes as a result of that.
The climax might not be what you think, but in a way it's a fitting ending to the story. Though they get good support from the rest of the cast Heflin and Ryan dominate the story though they have no scenes together until the end. Act Of Violence is a noir classic and fans of Heflin and Ryan should list it among their best performances.
