DHS 'Puppet Master' Ops Infiltrated Activists; 15 Charged

Undercover agent UCA 9833 sat in a Minneapolis library on Jan. 31 and recorded supporters of the Sunrise Movement discussing sit-ins and de-escalation tactics — not attack plans. For cybersecurity and privacy professionals, the Puppet Master files are a case study in covert collection tradecraft applied to domestic political speech, and a warning about the oversight gap between an operation's criminal predicate and its actual surveillance footprint.

Federal court documents filed Thursday in the U.S. District Court for Minnesota reveal that the Department of Homeland Security ran a sweeping undercover surveillance operation — codenamed Operation Puppet Master — targeting progressive organizations, labor unions, and protesters opposing the immigration crackdown that was then unfolding across Minneapolis. A second, later effort, Project Whipple Shield, extended the operation. The disclosures surfaced in a motion filed by defense attorney Kevin Riach, who represents one of 15 people charged by federal prosecutors in June with impeding the crackdown, on allegations ranging from throwing ice chunks to erecting blockades.

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Undercover agent UCA 9833 sat in a Minneapolis library on Jan.

The documents paint a picture of federal infiltration that reached far beyond the alleged criminal conduct. According to the filings, Homeland Security Investigations (HSI) undercover personnel attended meetings held in churches, schools, and parks — gatherings that were often little more than discussions of constitutionally protected protest activity. In one documented episode, an undercover officer identified only as 'UCA 9833' attended a Jan. 31 meeting in a Minneapolis library and listened as supporters of the Sunrise Movement, a progressive climate organization, discussed sit-ins, de-escalation tactics, and the logistics of having a police liaison and safety marshal present.

That distinction — between monitoring violent conspiracies and recording protected political speech — is the legal fault line of the case. Riach's motion describes Puppet Master and Project Whipple Shield as a 'broad and irrational investigation' driven by politics rather than criminal conduct, and asks the court to compel disclosure of additional material collected during the operations. HSI declined to comment, citing a policy against discussing ongoing investigations or investigative methods, and referred questions to the U.S. attorney's office in Minnesota, which did not immediately respond to an after-hours inquiry from The Associated Press.

The targeting of labor unions and advocacy groups is especially consequential. Union meetings and organizing spaces carry strong statutory and constitutional protections, and the revelation that federal agents infiltrated them is likely to draw scrutiny from labor-law practitioners, state officials, and the National Labor Relations Board. Likewise, the use of undercover officers inside churches and schools — traditionally sensitive locations with heightened privacy expectations — complicates the government's ability to use any resulting evidence and exposes HSI to accusations of overreach.