J.R. is a typical Italian-American on the streets of New York. When he gets involved with a local girl, he decides to get married and settle down, but when he learns that she was once raped, he cannot handle it. More explicitly linked with Catholic guilt that Scorsese's later work, we see what happens to J.R. when his religious guilt catches up with him.
This was Martin Scorsese's first feature film as director and that is pretty much the reason why most people will watch this. It isn't bad, and it does show some of the preoccupations that would stay with him throughout his career (men in isolation, Catholic guilt - in spades). But the narrative is a little fragmented (it was filmed over three years and went through many changes. Still worth seeing though.