Surveillance of ICE Observers: Federal Court Filing Alleges DHS Maintained Secret Dossiers on Citizens Exercising First Amendment Rights

A newly unsealed court filing in a high-stakes class-action lawsuit has brought to light serious allegations regarding the surveillance practices of the U.S. Department of Homeland Security (DHS). The litigation, currently unfolding in the federal district court of Maine, centers on claims that DHS agents utilized a sophisticated case management system—built by technology firm Palantir—to track, photograph, and document private citizens who were observing immigration enforcement actions. The plaintiffs, a group of four individuals, contend that these efforts were not merely investigative but were calculated acts of intimidation designed to suppress First Amendment activities.

The Core Allegations and the Role of ICM

The lawsuit, brought by plaintiffs Elinor Hilton, Colleen Fagan, Polyxenia Pantos, and Carlyn Williams, alleges that DHS agents engaged in a pattern of behavior that crossed the line from professional law enforcement to the systematic monitoring of political speech. Central to the case is the Investigative Case Management (ICM) database. Originally developed by Palantir under a contract awarded in 2014, the ICM system is the primary digital infrastructure used by Homeland Security Investigations (HSI) to track active cases.

According to the legal documents, which are heavily supported by internal government records and agent depositions, HSI personnel utilized this system to create dossiers on non-criminal observers. The filing details how agents, specifically one individual identified as “Agent J.C.,” documented the activities of these observers, recording their physical descriptions, vehicle information, and license plate numbers. In some instances, these records were labeled with descriptors such as “Threat to Law Enforcement” or “Professional Protestor,” despite the plaintiffs’ assertions that their activities were limited to non-violent observation of public immigration enforcement efforts.

Chronology of Events: The Maine Surge

The allegations stem largely from events surrounding “Operation Catch of the Day,” an immigration enforcement surge conducted in Maine in January 2026. The surge, aimed at identifying individuals for removal, drew significant attention from local activists who sought to observe and document the proceedings.

• January 20, 2026: During an enforcement action in Portland, Maine, plaintiff Polyxenia Pantos photographed an arrest while stationed near their spouse’s vehicle.
• Post-Incident Investigation: Within hours, Agent J.C. allegedly utilized the Accurint database—a LexisNexis product utilized by law enforcement—to trace the vehicle’s license plate. This allowed the agent to obtain personal data, including the home address, phone numbers, and cohabitants of the vehicle’s registered owner, Carlyn Williams.
• Direct Contact: Following the identification process, the filing states that J.C. contacted Williams via telephone. During this call, the agent allegedly identified himself only as “the Department of Homeland Security” and warned that individuals “doing things like that” could be added to a “domestic terrorism watchlist.”
• Retaliatory Measures: The plaintiffs allege that the impact of these actions extended beyond immediate harassment. One observer reported being flagged for secondary screening at the border, a status that is expected to persist until at least January 2027.

Technological Infrastructure: The Palantir Connection

The use of the ICM system has drawn scrutiny due to its integration with other federal security databases. According to a 2016 DHS privacy impact assessment, records created within the ICM platform are automatically shared with the U.S. Customs and Border Protection (CBP) TECS system. This interoperability means that a notation made by a single agent in Maine can result in a “lookout” flag that alerts federal officers at airports and border crossings nationwide.

Palantir, the firm behind the Gotham-based software, has maintained a long-term partnership with the agency. In 2022, the government awarded Palantir a five-year contract valued at approximately $96 million for ongoing ICM support. Furthermore, in 2025, an additional $30 million was allocated to the project to facilitate the development of “ImmigrationOS,” an upgraded platform intended to consolidate agency operations. While Palantir has declined to comment on the specific allegations in the lawsuit, the contract values highlight the massive scale of the data-processing capabilities now at the disposal of DHS field agents.

Official Responses and the Government’s Defense

The Department of Homeland Security has categorically denied the existence of a “domestic terrorism” database targeting protestors. In response to the unsealed filing, a DHS spokesperson described the case as “meritless,” asserting that the claims are built on the false premise that the agency maintains a standalone system for tracking citizens based on their political activities.

Government attorneys, in a formal motion to dismiss, argue that the incidents cited in the lawsuit were isolated deviations from agency policy rather than systemic practice. The defense asserts that Agent J.C. created the records based on a genuine, albeit individual, belief that the observers posed a “potential threat to law enforcement” during high-stress encounters. The government further denies that any of the plaintiffs were nominated for inclusion on a federal terrorist watchlist, framing the interactions as standard law enforcement warnings regarding the risks of interfering with official duties.

Broader Implications: First Amendment and Civil Liberties

The legal battle represents a significant test of the boundaries between national security surveillance and the right to public assembly. Legal experts representing the plaintiffs, such as JoAnna Suriani of the organization Protect Democracy, argue that the “chilling effect” of these tactics is undeniable. Following the phone call from Agent J.C., both Pantos and Williams reportedly ceased their observation activities, fearing further retribution.

The plaintiffs are seeking judicial relief that would require the government to archive or delete the records created on them, as well as an injunction to prevent DHS agents from engaging in home-visit intimidation or using the threat of watchlist status to deter First Amendment expression.

From a civil liberties perspective, the case raises critical questions regarding the lack of transparency in how federal agencies use “case management” software to categorize and monitor domestic populations. Because the ICM system is technically an investigative tool, it operates with fewer public oversight mandates than programs explicitly designated for domestic intelligence.

As the case proceeds, the court will likely need to determine whether the actions taken by agents in Maine were authorized under current operational guidelines or if they represent an unconstitutional overreach of federal surveillance power. The outcome could establish a significant precedent for how the government uses predictive data and inter-agency information sharing to manage interactions with activists and journalists who monitor the activities of immigration authorities.

The public disclosure of these internal practices serves as a rare window into the “backend” of federal enforcement, highlighting the tension between the government’s need for operational security and the fundamental American right to hold public officials accountable without fear of state-sponsored retaliation. Whether these incidents are indeed the acts of rogue actors or a systemic byproduct of modern, technology-enabled policing remains the central question for the federal court to resolve.