A coalition of transparency and animal rights groups on Monday released that letter, along with a cache of government documents, to highlight the tight links between law enforcement and agriculture industry groups.

Activists say those documents show an unseemly relationship between the FBI and Big Ag. The government–industry fearmongering has accelerated with the spread of bird flu enabled by the industry’s own practices, they say.

The executive director of Property of the People, the nonprofit that obtained the documents via public records requests, said in a statement that the documents paint a damning picture.

“Factory farms are a nightmare for animals and public health. Yet, big ag lobbyists and their FBI allies are colluding to conceal this cruelty and rampant disease by shifting blame to the very activists working to alert the public,” Ryan Shapiro said. “Transparency is not terrorism, and the FBI should not be taking marching orders from industry flacks.”

Animal rights activists have long said that federal law enforcement seems determined to put them in the same category as Al Qaeda. In the 2000s, a wave of arrests of environmental and animal rights activists — who sometimes took aggressive actions such as burning down slaughterhouses and timber mills — was dubbed “the Green Scare.”