What Makes Sammy Run?

It would be 2.5 stars actually. They are given in the name of the great beginning, that involved me completely despite the far away setting - screenplay writing in Hollywood in the early 40s - and because of the human qualities- the ambition portrayed by Sammy Glick(stein) and well described.
Didn't care for the ending: the union stuff bored me, and his marriage deserved more spotlight.