The KGB didn’t need to break into CIA headquarters to gut American intelligence operations in the Soviet Union. They just waited for a mid-level officer to walk into their embassy with a letter. That’s exactly what happened on April 16, 1985, when Aldrich Ames handed a receptionist an envelope containing the names of U.S. agents working inside the USSR. Within months, roughly 20 of them were arrested or executed. The man who caused it wasn’t a smooth-talking operative — he was a struggling alcoholic with a theater degree and a mounting pile of debt.
Ames’ path to becoming the most damaging double agent in CIA history started long before that embassy visit. He’d joined the agency in 1957 as a high school student doing clerical work, then dropped out of the University of Chicago after his theater obsession tanked his grades. He eventually finished a history degree at George Washington University in 1967 while working full-time at the CIA. By the late 1960s, he and his first wife, Nancy Segebarth — herself a CIA trainee who was pushed out after their marriage — were posted to Ankara, Turkey.
A Career Built on Second Chances
His performance in Turkey started strong but quickly soured. Supervisors began suggesting he belonged behind a desk at Langley rather than in the field. Back in Virginia, his alcohol problems and chronic procrastination became talking points among colleagues. Yet the agency kept promoting him anyway. In the late 1970s, he earned glowing reviews in New York City, where his language skills and report-writing stood out. That didn’t stop him from leaving a briefcase full of classified documents on the subway in 1976, or top-secret communications gear in his office in 1980. Neither incident resulted in official discipline.
By September 1983, Ames was promoted to counterintelligence branch chief for Soviet operations. That gave him access to the crown jewels: the identities of U.S. assets inside the USSR, their handlers, and the technical methods used to communicate with them. He later told the National Security Archive that he believed the CIA’s Soviet espionage efforts “had virtually never, or had very seldom, produced any worthwhile political or economic intelligence on the Soviet Union.” That rationalization made it easier to justify what came next.
The Financial Squeeze That Started It All
Money, not ideology, drove Ames to betrayal. His first marriage collapsed amid overseas assignments and a new relationship with Maria del Rosario Casas Dupuy, a Colombian diplomatic staffer he’d met in Mexico City. By 1983, Rosario had moved in with him, and the divorce settlement left him owing tens of thousands of dollars. Rosario’s expensive tastes didn’t help. In his post-arrest interview, Ames described feeling “one of terrible desperation” about his finances. He later told the Senate Select Committee on Intelligence: “I felt a great deal of financial pressure, which, in retrospect, I was clearly overreacting to.”
His initial plan was a one-off transaction. He’d hand over some names, collect $50,000, and walk away. In Senate testimony, he described it as “a very clever plan to do one thing.” But after the money arrived, he realized there was no going back. “The fear that I had crossed a line, which I had not clearly considered before,” he said, hit him hard after mid-May 1985.
How the Betrayal Unfolded
Ames didn’t use elaborate spycraft. He’d grab classified documents from his office, wrap them in plastic, and pass them to his KGB handlers during what looked like routine lunch meetings with Soviet diplomats. Occasionally, he used a dead drop — a USPS mailbox marked with a chalk swipe. If the KGB retrieved the package, they’d erase the chalk as confirmation.
The results were catastrophic. Starting in late 1985, CIA agents across the Soviet Union began vanishing. By 1986, The Washington Post reported that the KGB might run out of spies to arrest. At least 10 of Ames’ compromised assets were executed, including General Dmitri Polyakov, one of the most valuable U.S. sources in Soviet military intelligence. Oleg Gordievsky, a KGB officer working for British intelligence, barely escaped — part of his getaway involved hiding in a car trunk.
Ames later admitted he didn’t fully process the human cost. “I’m sure I must have thought in terms of ‘These guys will actually be okay in certain ways, because of their need to protect me,'” he told interviewers, “but that was about as far as I went in terms of giving that consideration.”
The Mole Hunt Team That Refused to Quit
The CIA assembled a special task force in 1986, codenamed Play Actor, to find the leak. The team included Jeanne Vertefeuille, Fran Smith, and Sandra “Sandy” Grimes — women assigned partly because of the agency’s outdated belief that “little gray-haired old ladies” were best suited for combing through files. They proved essential. Grimes had carpooled with Ames in the 1970s, riding in his old Volvo before KGB money bought him a series of Jaguars.
The breakthrough came from an unlikely source: Rosario’s friendship with Diana Worthen, a CIA employee who’d worked for Ames. When Rosario mentioned paying $540,000 in cash for their Arlington home and described her remodeling plans, Worthen grew suspicious. She knew what Ames earned. The resulting financial inquiry found three massive deposits in his bank accounts throughout the 1980s, each coinciding with meetings he’d had with Soviet officials.
The Final Surveillance Push
By 1992, the FBI had joined the investigation. Agents followed Ames, bugged his phones, and planted listening devices in his home, office, and car. They even used a small Cessna nicknamed the “Flying Screw” to track his movements, much to the annoyance of his Arlington neighbors. Getting inside his house required a covert entry team with keys, drills, and drywall patches to hide the bugs.
The decisive break came in October 1993, when agents went through the Ames family trash and found a Post-it note detailing a meeting with a KGB contact in Bogota, Colombia. The FBI followed him to South America and recorded the meeting, though they didn’t capture clear evidence of an exchange. When Ames was arrested at his home in February 1994, he was one day away from flying to Moscow on an official CIA trip. Agents feared he’d defect permanently.
The Aftermath and the “Fourth Man” Question
Ames pleaded guilty to conspiracy to commit espionage and tax evasion. Rosario received a 63-month sentence and has since been released. Aldrich Ames got life in prison, where he remains. The damage he caused was so extensive that his case is still considered the worst espionage disaster in U.S. history.
But Ames wasn’t the only one. Edward Lee Howard, a CIA officer who defected to the Soviet Union, died there in 2002 under suspicious circumstances. Robert Hanssen, an FBI agent who spied for Moscow from 1979 to 2001, was caught in part because Ames’ arrest prompted the FBI to investigate its own ranks. Hanssen received 15 life sentences and died in prison in 2023.
Some intelligence analysts argue that neither Ames, Howard, nor Hanssen had access to everything the KGB received. That raises the possibility of a “fourth man” — a mole who’s never been caught. Several high-ranking officials were investigated over the years, but no one was ever definitively identified. The question of whether another traitor slipped through the net remains unanswered.
