Graphic videos released by an activist group show workers abusing calves and using drugs at Indiana's largest dairy operation, Fair Oaks Farms.

The Animal Recovery Mission released a four-minute, 11-second video on June 4 that accuses the northern Indiana farm of "daily mistreatment of the resident farm animals." The group later released two additional videos.

Fair Oaks Farms' founder Mike McCloskey admitted the abuse took place and took "full responsibility."

Here's what we know about the videos, the group that produced them and Fair Oaks Farms' reaction.

Video of abuse at Fair Oaks Farms

Fair Oaks has been called the "Disneyland of agricultural tourism" in Food & Wine magazine, and welcomes 600,000 visitors each year. School groups, families and other guests visit the museum, dine in the restaurant and watch cows being milked in the glass-enclosed assembly line.

ARM's video tarnishes that clean, tourist-friendly image. It shows Fair Oaks Farm workers beating calves with metal bars, burning them with branding irons and throwing them into huts and trucks.

The video also allegedly shows marijuana being grown, smoked and transported on the farm.

Second video released

Animal Recovery Mission released a second undercover video from Fair Oaks Farms on June 7.

The video, more than an hour and a half long, shows additional abuse against animals, more alleged drug use against Fair Oaks Farms employees and poor living conditions for the animals.

WARNING: BELOW VIDEO CONTAINS GRAPHIC FOOTAGE

Third video released

On the evening of June 11, ARM released a video called "Operation FairLife" that shows graphic footage of alleged abuse toward sick and injured cows as they're being milked.

WARNING: BELOW VIDEO CONTAINS GRAPHIC FOOTAGE

Employees fired, police contacted

McCloskey, the farm's founder, took responsibility for the abuse in a Facebook post. He said the company fired four employees and banned a third-party truck driver who were shown in video.

"I am disgusted by and take full responsibility for the actions seen in the footage, as it goes against everything that we stand for in regards to responsible cow care and comfort," McCloskey wrote.

"The employees featured in the video exercised a complete and total disregard for the documented training that all employees go through to ensure the comfort, safety and well-being of our animals."

"Of the four who were our employees, three had already been terminated prior to us being made aware months ago of the undercover ARM operation," McCloskey said. "They were identified by their co-workers as being abusive of our animals and reported to management."

Fair Oaks Farms is investigating all aspects of the the video, after which McCloskey said "disciplinary action will be taken, including termination and criminal prosecution."

McCloskey said the worker depicted using drugs in the video was turned in months ago by a co-worker. A manager called police and made a police report, McCloskey said.

But he denied the video's claim that marijuana had been grown and cultivated on Fair Oaks Farms property.

"The plants featured in the video are an invasive perennial species that is rampant on farms all over the Midwest," McCloskey said.

A post made by the Fair Oaks Farms Facebook page again took responsibility for the actions in the video. "Many of you have reached out to express your disappointment, heartbreak and anger regarding the videos released yesterday and we want you to know that we share those same feelings and take full responsibility," they wrote to their fans. The post also pledged to put actions in place to prevent this from happening again.

3 charged in Newton County

Three people face criminal charges in connection with the investigation, the Newton County Sheriff's Office announced on June 10.

Authorities said the three former employees were charged with beating a vertebrate animal, a misdemeanor. They have been identified as 31-year-old Santiago Ruvalcaba Contreros, 36-year-old Edgar Gardozo Vazquez and 38-year-old Miguel Angel Navarro Serrano.

According to the Newton County Sheriff's Office, police have arrested Gardozo Vazquez and are still working to locate and arrest the other two suspects. Other "persons of interest" are also being interviewed in the case, investigators said.

"We acknowledge the need for humane treatment of animals and the need to hold individuals that have gone beyond an acceptable farm management practice accountable for their actions," Newton County Sheriff Thomas VanVleet said in a statement.

VanVleet also said investigators are working with the Newton County Prosecutor’s Office.

"We will also be seeking the identity of the witness to the alleged crimes that failed to report this activity for some time," he said.

Changes at Fair Oaks Farms

McCloskey has said that cameras would be installed anywhere there are human-animal interactions to prevent something like this from happening again.

In a video, McCloskey said Fair Oaks Farms also will make the feeds from those security cameras live in the farm’s Dairy Adventure area so visitors will be able to see every part of the operations at any given time.

McCloskey said he understood that people had been asking why Fair Oaks Farms hadn’t installed cameras in the past, noting that cameras had been part of the discussions when Fair Oaks was first built.

But, McCloskey said, he thought Fair Oaks’ animal welfare training was strong enough that the business could trust workers and the system.

“That was a terrible judgment on my part,” McCloskey said. “The way I have to look at this is that as hard as we try, you can always end up with bad people within your organization, and this is what happened to us.”

McCloskey said Fair Oaks would also hire a private auditor who would have access to the operation to make unannounced visits to check on conditions. He said Fair Oaks also would hire someone to work solely on animal welfare issues at the farm.

What is Fair Oaks Farms?

Fair Oaks Farms is a museum, restaurant, gift shop and hotel built around a working dairy farm. It's located in Fair Oaks, Ind., just off I-65, about 109 miles north of Indianapolis and 76 miles south of Chicago.

The farm, where more than 15,000 cows are milked daily, has long been a popular school trip for kids from Indiana and neighboring states. Fair Oaks Farms attracts more than 600,000 visitors a year.

Attractions give visitors a close-up look at modern farming operations.

Connection to Coca-Cola

Fair Oaks Farms owners partnered with Coca-Cola in 2015 to produce and distribute Fairlife, a low-fat milk the two companies are marketing to the health conscious and the protein-chugging fitness crowd.

The owners of Fair Oaks Farms patented the cold-filtration technology used to produce a drink with 50 percent more protein, 30 percent more calcium and half the sugar of ordinary milk, according to a Feb. 3, 2015 article on Coca-Cola's website. Coca-Cola and Fair Oaks Farms make Fairlife and Core Power protein shakes.

Coca-Cola said in a statement to IndyStar that it takes animal welfare very seriously. It said the company has “full confidence” in Fairlife's management to “urgently address this issue with Fair Oaks Farms.” Fair Oaks has suspended all sourcing for Fairlife from the dairy location identified in the video, according to Coca-Cola.

Fairlife was recently sued by a California man over the labeling of its milk products. The federal lawsuit says Fairlife promised “extraordinary” treatment of its cows, a claim it alleges ARM's videos expose as false.

At least two retailers, Family Express and the Illinois-based Jewel Osco, have announced they are removing Fairlife from its shelves in the wake of the video.

What is ARM?

The activist group ARM was founded in 2010 by Florida Real Estate developer Richard "Kudo" Couto.

Miami New Times reporter Gus Garcia-Roberts described Couto as the "Bruce Wayne of animal rights," in a story published Feb. 3, 2011.

"For at least a year, Couto, real-estate developer by day, donned a disguise, two guns and a bulletproof vest for nightly motorcycle raids of a lawless area known as C-9 Basin — ground zero for illegal slaughterhouses and Miami-Dade County's horse meat black market," Garcia-Roberts wrote.

Undercover video

Couto's nonprofit deploys undercover investigators who apply for and get hired as entry-level farm hands. These agents use their behind-the-scenes access to covertly gather video of alleged animal abuse.

One of those undercover agents gathered the Fair Oaks Farm video.

Critics have called the tactics unfair.

"The fact that ARM takes months before notifying owners or authorities regarding on-going animal abuse is concerning," McCloskey said in his Facebook statement. "I have personally reached out to ARM’s founder, Richard Couto, to discuss a more symbiotic relationship but he has yet to reach back."

In addition to the investigation at Fair Oaks Farm, ARM has released information documenting alleged abuse, illegal horse slaughter, animal sacrifice and other misdeeds in the U.S. and Mexico.

Journal & Courier columnist Dave Bangert, Journal & Courier producer Nick Siano and IndyStar reporters Kellie Hwang and Crystal Hill contributed to this story.

Call IndyStar reporter Vic Ryckaert at 317-444-2701. Follow him on Twitter: @VicRyc.

Call IndyStar reporter Justin L. Mack at 317-444-6138. Follow him on Twitter: @justinlmack.