A sweeping Immigration and Customs Enforcement surveillance campaign placed activists, labor unions, nonprofits, and ordinary protesters under federal scrutiny during this year’s immigration crackdown in Minnesota. The operation, conducted through ICE’s investigative arm Homeland Security Investigations, has emerged as one of the most expansive federal investigations of the American left in decades.
The program came to light through discovery in the federal prosecution of 15 Minnesotans accused of conspiring to impede immigration-enforcement officers. Court filings describe two related investigations: Operation Puppet Master, opened on January 28, and Project Whipple Shield, launched roughly two weeks later. HSI assigned more than 120 agents to the Minnesota effort, including undercover operatives who attended activist meetings, entered encrypted Signal chats, and gathered information about demonstrations and organizers. The filings were made public in the Minnesota 15 case.
Investigators did not limit their attention to people accused of damaging property or physically confronting federal officers. The records describe undercover activity at churches, libraries, parks, schools, restaurants, and union halls, along with photographs, audio recordings, license-plate data, and database searches. Agents also reportedly pursued financial records belonging to organizations including the Service Employees International Union, Communications Workers of America, and Sunrise Movement. One court account says those records were sought without an identified criminal predicate.
The scale and methods have drawn comparisons to earlier domestic-intelligence campaigns, particularly the FBI’s COINTELPRO program and surveillance of civil-rights and anti-war organizers. That history matters because the First Amendment protects political association, protest, and criticism of government—even when demonstrations are directed at federal law enforcement. Defense attorneys characterize the Minnesota investigations as politically driven, while prosecutors have charged the defendants with conspiracy connected to efforts to interfere with the immigration operation.
The documents also suggest that the surveillance extended beyond Minnesota. Agents tracked events in other states, shared intelligence with local law-enforcement agencies, and used tools ranging from undercover sources to aerial and electronic monitoring. A separate account describes a Chicago-area task force using undercover agents, audio recordings, license-plate-reader data, and the city’s camera network to identify attendees at an anti-ICE event and map connections to other protests.
What happens next will likely turn on two questions: whether the government can show a genuine criminal basis for the investigation, and whether the defense can force disclosure of the full surveillance record. A federal judge has already been asked to order the release of additional materials. For activists and journalists, the case offers a stark warning that ordinary organizing—planning a march, attending a meeting, or discussing tactics in a private chat—can become part of a federal intelligence file when political dissent is treated as a security threat.
