Richard Boone
It was fun seeing Boone in this as a 20-something man, holding his own in scenes with Kirk Douglas.
My thought when he first appeared: "Uh, ohhh... It's the Battle of the Chins!"
Boone did an even better job menacing Marlon Brando's character in "Night of the Following Day." Check it out:
https://youtu.be/8rYT80yb-Hk