Jake Rodriguez was a motorcycle mechanic/ Tony Thornton was The Punching Postman Jack Dempsey was a pimp enforcer. Sonny Liston was a bonebreaker.
I don’t know if this is intended to mean guys who boxed while holding blue-collar jobs (not a helluva lotta white-collar pro boxers working in board rooms, that’s for sure) or guys who took a no-frills, nothing-fancy, blue-collar approach. I’ll assume the latter and throw out: Frank “The Animal” Fletcher James Scott Jesse James Hughes Vito Antuofermo Randy Shields Kevin Kelley Jose Luis Ramirez