Does this sound like the plot? It has the word Mob and shooting gallery? I guess not, no mention of professors in this one. Also in CASANOVA BROWN Cooper plays a professor.
Nan, a racketeer's daughter, is in love with The Kid, a shooting gallery showman. Despite Nan's prodding, The Kid has no ambitions about joining the rackets and making enough money to support Nan in the lifestyle she's accustomed to. Her attitude changes after her father implicates her in a murder and she's sent to prison. During her incarceration, her father convinces The Kid to join the gang in order to help free Nan. When Nan is released, she wants nothing more to do with the mob and tries to get The Kid to quit, but she may be too late.
Much easier to pull an image off a DVD, like ol Robert Vaughn firing a P.38