A northwest Indiana dairy farm has fired four employees seen in a graphic undercover video released Tuesday by an animal welfare organization showing animals being abused. Following an investigation into the abuse, at least three retailers announced Wednesday that they would remove all Fairlife products from their shelves. The Coca Cola Corporation, which distributes the brand, said it was in talks to have sourcing from the farm in question discontinued. The Animal Recovery Mission called it the largest undercover dairy investigation in history" and said the video documents "systemic and illegal abuse" at Fair Oaks Farms in Indiana. ARM said an investigator spent three months undercover at the Prairies Edge North Barn after being hired as a calf care employee. The group noted that Fair Oaks Farms North Barn was not targeted, but rather the barn was the first farm to hire the investigator, who had applied to multiple dairy farms in Jasper and Newton Counties in Indiana. "Employees were observed slapping, kicking, punching, pushing, throwing and slamming calves," ARM said in a statement. "Calves were stabbed and beaten with steel rebars, hit in the mouth and face with hard plastic milking bottles, kneed in the spine, burned in the face with hot branding irons, subjected to extreme temperatures, provided with improper nutrition, and denied medical attention." The footage was released on social media (warning: footage is graphic) Tuesday, where it has since garnered more than 100,000 views on Facebook and more than 1 million views on Vimeo.