Maybe this wowed them in the 50's, but this is one of those flicks that doesn't age well. It's got that preachy, earnest, downtrodden working man vibe of a 2nd rate Rod Serling live TV "Playhouse" broadcast. The "plot" is by the book, the Cassevetes character's troubled background seems tacked-on, and the love interest is unconvincing and half-hearted.
Sidney Portier gives an OK performance, but man he sure was an annoying, haughty snot. If I had to work with this guy in a warehouse I'd probably want to hit him with a grappling hook too. Jack Warden is good, because as usual, he plays Jack Warden.
Like 90% of the films rated on IMDb (whether they are classics, mediocre or crapola) somehow this one gets rated with 7-point-some-stars. It is in no way deserving of that. Save your time