The suit, filed by the legal nonprofit Protect Democracy and the law firms Dunn Isaacson Rhee and Drummond Woodsum, alleges federal agents are unconstitutionally retaliating against people who are lawfully observing and recording federal immigration enforcement operations by gathering their personal information and labeling them domestic terrorists.

“Plaintiffs must either abandon their constitutional rights or accept being cataloged and branded as ‘domestic terrorists,’” reads the lawsuit, which was filed in federal district court in Maine on Monday. “That is a choice the Constitution does not require Plaintiffs, or anyone, to make.”

After the lawsuit was filed Monday, DHS told NPR in a statement: “There is NO database of ‘domestic terrorists’ run by DHS. We do of course monitor and investigate and refer all threats, assaults and obstruction of our officers to the appropriate law enforcement. Obstructing and assaulting law enforcement is a felony and a federal crime. Our law enforcement methods follow the U.S. Constitution.”