“I’m told I was a violent child,” Douglas Armstrong, better known as “Arm,” says in the opening voiceover of “The Shadow of Violence.” Played by Cosmo Jarvis, he’s a visibly haunted former boxer with ...

Early in “The Shadow of Violence,” a beefy Irish thug named Douglas Armstrong (“Arm” to everybody) defends his day job of beating people up for local gangsters by saying, “They say violence is done by ...

Two powerful performances dominate a brutal Irish drama about divided loyalties from first-time feature director Nick Rowland. “I’m told I was a violent child,” Douglas Armstrong, better known as “Arm ...