“This is where your chicken dinner begins,” says the narrator of a disturbing video filmed at four Tyson Foods factories in Virginia. The video shows workers abusing breeder birds, the parent flocks of the chickens that will be raised and killed for meat.

Compassion Over Killing, a D.C.-based advocacy group, released the footage, which was filmed by one of its undercover investigators. It shows employees punching, kicking, swinging, and throwing chickens around the factories. The workers run over birds, strangle them, and stick bones through their nostrils.

It’s extremely graphic.

In the video, a worker is heard telling another employee that he shouldn’t be standing on a bird’s head and letting it suffocate because “it’s inhumane.” Plus, he adds that someone from animal control may see it happening and “they’ll take you to court for that.”

Tyson is the largest chicken-processing company in the country.

All of the factories shown in the video are at least a three hour drive from D.C. Two of them are in Mecklenburg County, one is in Buckingham County, and the other is in Lunenburg County, according to The Washington Post, which first reported the footage.

Tyson is “literally crushing the life out of birds,” Erica Meier of Compassion Over Killing said in a release. The organization has sent the video authorities, “calling for prompt enforcement action.” Animal control officials in Mecklenburg and Buckingham counties told The Post they were investigating the incidents.

In response to the footage, Tyson released a statement on Facebook saying, in part, “we are disgusted by the actions of the individuals in the video. We do not tolerate this type of activity.” The company has fired all of the employees in the video, according to the statement. “It was an obvious decision given that the entire crew was trained in proper animal handling yet chose to ignore it and failed to alert management of the mistreatment.”