The Humane Society of the United States announced it has purchased shares of Steak 'n Shake and Jack in the Box restaurants, according to The action is part of an HSUS effort to pressure the restaurants to stop purchasing eggs from caged hens, pork from crated sows, and poultry from producers that use certain slaughter methods.

HSUS uses its shareholder status to propose changes to publicly traded companies and has charged both companies with a "complete lack of meaningful movement on animal welfare."  Restaurant chains such as Burger King, Wendy's, Quiznos, Denny's, Hardee's and Carl's Jr. have already created policies more to the animal activist group's liking.