piece of the action

(idiomatic) A portion of the monetary gains or other benefits produced by some venture or activity; a share of participation in a venture or activity.

Example: 1969, Mario Puzo, The Godfather, Google online preview:
  "Sollozzo is coming to us for help," Hagen said. . . . "For that we get a piece of the action."
1997 June 29, David W. Dunlap, "The Sign Makers Turn Up the Wattage," New York Times (retrieved 9 Dec 2012):
  Landlords who were once content to lease rooftops or facades to sign companies now demand a piece of the action, in a joint venture or a limited partnership.
2001 June 11, Tim Padgett and Elaine Shannon, "La Nueva Frontera: The Border Monsters," Time:
  There are two ways to get a piece of the action at any of the big drug markets along the border: pay off—or kill off—anyone who stands in your way.
2003 April 7, Sonny Inbaraj, "Iraq: Australian Firms Eye Spoils of War in post-Saddam Era," Inter Press Service (retrieved 9 Dec 2012):
  Australian companies are already manoeuvring for a piece of the action in the reconstruction of Iraq,