The Chilean Embassy Bug and the FBI's Secret Proxy

By Miriam Adler ·

A Top Secret memo, held for decades, exposes how the CIA used the FBI to breach the Chilean embassy and spy on Israeli diplomats while scrubbing the record for Senate investigators.

Salvador Allende sought to rebuild Chile into a socialist paradise, but he spent his presidency under the invisible weight of a listening post. The cost of this breach was the absolute compromise of his government's most sensitive communications, a betrayal orchestrated in Washington on soil that should have been inviolable.

I am working from the archive's curated description of the document: an FBI memorandum from Sebastian S. Mignosa to Assistant Director W. Raymond Wannall, dated August 18, 1975. This Top Secret communication, filed under "SENSTUDY 75," was not an intelligence report, but a counterintelligence review of a portion of the CIA's infamous "Family Jewels" file. The memo was designed to identify activities that "might implicate the FBI in activities outside the CIA charter."

The Chilean Project

The record describes an operation known as the "Chilean Project," a collaboration that blurred the legal boundaries between domestic law enforcement and foreign espionage. In this operation, the CIA—the civilian foreign intelligence service tasked with global collection and covert action—convinced the Attorney General to command the FBI to install a microphone at the Chilean Embassy in Washington, D.C. The FBI, the domestic security service of the United States reporting to the Department of Justice, acted as the technical hand, performing the actual break-in and installation.

According to the record, the objective was "to collect foreign intelligence data and to compromise classified encrypted diplomatic traffic" belonging to the government of President Salvador Allende. The public record establishes that Allende, a socialist who took office in 1970, was the first Marxist elected president in a liberal democracy in Latin America. He attempted to modernize the Chilean economy through initiatives like Project Cybersyn, a distributed decision-support system using telex machines and a mainframe to manage national production.

There is a cold irony in the intersection of these two projects. While Allende was attempting to use a futuristic computer network to liberate the Chilean economy, the United States was using a primitive microphone to steal the blueprints of that same economy's diplomatic movements. The record notes that "special coverage of the Chilean Embassy was discontinued in February, 1973."

Document imagery from nsarchive.gwu.edu From the files: nsarchive.gwu.edu

The October Deadline

The memo reveals that the FBI's appetite for diplomatic intrusion extended beyond the socialist experiments of Latin America. The record explicitly mentions the "FBI bugging of the 'diplomatic establishments of Israel,'" a state in the Southern Levant that the United States traditionally considers its closest regional ally. This surveillance was "discontinued on 10/16/72."

This date is not a random administrative marker. The public record shows that the FBI had been surveilling Israeli officials for an "unknown amount of time" leading up to that October day. The desk's reading is that these "discontinued" dates are markers of geopolitical shifts and regime changes rather than the conclusion of intelligence interests. In the case of Chile, the bugging stopped in February 1973; by September of that year, Allende was dead and a military junta had seized power. The surveillance did not end because the intelligence was no longer needed, but because the target had been neutralized.

The French Connection

The record details a third vein of illegality: "surreptitious entries by CIA into a French diplomatic establishment" in Washington, D.C., during the early 1960s. This was an era of extreme volatility in the Cold War, and the record indicates that the highest levels of the American government were not merely aware of these intrusions but had sanctioned them.

President John Fitzgerald Kennedy, the 35th president whose tenure was defined by the brinkmanship of the Soviet Union and Cuba, was personally apprised of the operation. He was joined in this circle of knowledge by Secretary of State Dean Rusk, who managed U.S. diplomacy from 1961 to 1969, and Attorney General Robert Kennedy, who provided the high-level legal cover and oversight for the entries.

The line drawn here is clear: the CIA leveraged the Attorney General to use the FBI as a proxy for bugging operations. By routing the orders through the Department of Justice, the CIA could obtain the technical capabilities of the FBI—the domestic experts in surreptitious entry—while remaining shielded by the Attorney General's authority. It was a closed loop of power that bypassed the CIA's own charter, which forbade domestic operations.

A Map of Liability

Throughout this six-page memorandum, there is a glaring void. The record provides meticulous details on who was bugged, where the microphones were placed, and exactly when the operations stopped. However, it contains absolutely no intelligence findings. There are no summaries of the "compromised encrypted diplomatic traffic," no reports on the Israeli officials' conversations, and no analysis of the data harvested from the French embassy.

The pattern suggests that the document deliberately separates the "process"—the illegal act of bugging—from the "product"—the intelligence gathered. By doing so, the authors ensured that the operational value of the surveillance remained classified, even as the legal breach was admitted for the sake of the Senate investigation.

If the shape of this file is what it appears to be, this memorandum was never intended to be a transparent accounting of government misconduct. The desk's reading is that the memo is a legal liability map rather than an intelligence summary. Its primary function was to isolate the FBI's exposure from the CIA's broader misconduct. By identifying specifically which activities "might implicate the FBI," the Bureau was essentially scrubbing its own record, identifying the points of contagion before the full "Family Jewels" report reached the Senate committee.

This was a sanitation exercise. The FBI functioned as a domestic "cut-out," providing the CIA with a way to operate in jurisdictions where the CIA was legally blind. When the 1975 investigations began, the FBI's priority was not to expose the violation of diplomatic immunity or the betrayal of allies, but to ensure that the Bureau's role as the CIA's technical proxy was framed as a matter of administrative order rather than criminal conspiracy.

The pattern is consistent. The government admits to the break-in to avoid the discovery of what was stolen. The names of the operators are withheld, the intelligence is erased, and the legal liabilities are mapped and neutralized. The people who paid for this—Allende, the Israeli diplomats, the French attaches—are treated as footnotes in a memo about internal agency exposure. The full release of these files would likely show that the intelligence gathered from these bugs continued to fuel U.S. policy long after the microphones were officially "discontinued."

Sources

  1. FBI memorandum, Sebastian S. Mignosa to Assistant Director W. Raymond Wannall, “SENSTUDY 75,” Top Secret, August 18, 1975, 6 pp. — National Security Archive (GWU)
  2. Document PDF (FBI memorandum, Sebastian S. Mignosa to Assistant Director W. Raymond Wannall, “SENSTUDY 75,” Top Secret, August 18, 1975, 6 pp.)
  3. Background: Project Cybersyn — Wikipedia