The activist group Mercy for Animals releases undercover video shot at Sparboe Farms . A worker in a cage is seen inside the farm on April 6, 2014 in North Dakota. The FDA finds `` serious violations '' at five of the company 's production facilities . The Humane Society of the United States advocates for so-called cage-free systems , which allow hens to walk around , spread their wings and lay their eggs in nests . The egg industry has been a frequent target of animal rights groups .
The activist group Mercy for Animals releases undercover video shot at Sparboe Farms . A worker in a cage is seen inside the farm on April 6, 2014 in North Dakota. The FDA finds `` serious violations '' at five of the company 's production facilities . The egg industry has been a frequent target of animal rights groups .