No aspect of Cold War history has been more romanticized, more fictionalized, and more misreported than espionage. For more on the intelligence and espionage overview; the American agency involved in most of these cases is covered in the CIA’s history and operations; the Soviet agency that ran many of them is treated in the KGB’s history and operations.
The Cold War produced agents who genuinely mattered: people whose decisions changed the course of policy, who passed secrets worth lives, and whose betrayals destroyed networks painstakingly built over decades. Four cases dominate the historiography — the Cambridge Five, the Rosenbergs, Aldrich Ames, and Oleg Penkovsky — and they illustrate four distinct modes of espionage: ideological penetration from within, ideological commitment combined with technical access, money-driven treason — the defector-as-intelligence-asset.
The Cambridge Five
Kim Philby, Donald Maclean, Guy Burgess, Anthony Blunt, and John Cairncross were recruited in the 1930s while students at Cambridge, where Soviet intelligence ran an effective sub-recruitment operation through the university communist cells and through intermediaries like Arnold Deutsch, who later ran the London “Station” for the NKVD. Four of the five went on to work in British intelligence (Philby in MI6, Burgess in MI5 and then the BBC, Blunt in MI5, Maclean in the Foreign Office after a brief MI6 stint); Cairncross was a civil servant in the Treasury and, after the war, in GCHQ.
The group was at its most productive between 1941 and 1951. Philby, who had been head of the Iberian section of SIS during the Second World War and who later became MI6’s Washington liaison (and thus had access to Anglo-American secrets including the early atomic intelligence), was the most damaging. He warned the Soviet Union of Anglo-American operations in the Balkans and warned Maclean and Burgess in 1951 that they were about to be arrested, allowing both to defect. Blunt’s confession in 1964, in exchange for immunity, established the network’s existence for British intelligence; he was publicly exposed in 1979.
The historiography has been shaped by two books: Anthony Cave Brown’s Treason in the Blood (1994) and, more importantly, Christopher Andrew’s The Defence of the Realm (2010), the authorized history of MI5. Andrew and his co-author Vasili Mitrokhin established, on the basis of the Mitrokhin archive and Venona decrypts, that the Five were real, that their work was substantial, and that the British security services had a clearer picture of the damage than they admitted publicly for decades.
The Rosenbergs
Julius and Ethel Rosenberg were arrested in July 1950, convicted on March 29, 1951, and executed at Sing Sing on June 19, 1953. They were the only American civilians executed for espionage during peacetime. For half a century the case was the central political trial of the American left; since 1995 it has been the subject of detailed reassessment.
The Venona decrypts, released in 1995, and the Soviet documents that followed — including Anatoly Yatskov’s confession, Khrushchev’s memoirs, post-1991 releases from the KGB’s files — established three things. First, Julius was a member of a Soviet network run by Anatoly Yatskov, working under GRU cover in New York, and he did pass information related to the atomic bomb. Second, the specific material he provided was, in the assessment of the physicists who later reviewed the case, less important than the prosecution claimed — David Greenglass’s testimony about an “implosion lens” sketch has been described by historian John Earl Haynes and Harvey Klehr in Spies: The Rise and Fall of the KGB in America (2009) as substantially fabricated or, at minimum, exaggerated. Third, Ethel’s role was, at most, peripheral. The death sentence for both was a product of Cold War atmosphere and Judge Irving Kaufman’s belief, expressed at sentencing, that the atomic bomb was a “greater qualitative threat” than the Korean War.
The most widely held current view, expressed in the works of Haynes, Klehr, and Ronald Radosh’s The Rosenberg File (1983, updated 1997), is that Julius was guilty of espionage but not of “stealing the secret of the atomic bomb” in any meaningful sense; that Ethel was convicted on the basis of her brother’s self-serving testimony; and that the death penalty for either was excessive. The case remains contested, particularly on the left, but the major factual questions are no longer in serious dispute among scholars with access to the documents.
Aldrich Ames and Robert Hanssen
Aldrich Ames was a CIA case officer in the Soviet-East European division who had been on the agency’s rolls since 1962, with stints in Ankara, Rome, and New York. He was passed over for promotion in 1983 and, by his own account, walked into the Soviet embassy in Washington in April 1985 to volunteer. The KGB’s response was cautious; the rezidentura in Washington did not believe him at first. By June 1985 he had been paid $2 million up front and, over the next nine years, $2.7 million in total, and had begun to give up the names of CIA assets. At least ten of the assets he identified were arrested and executed; the number may be higher. The CIA’s intelligence network inside the Soviet Union was, in effect, destroyed.
The damage was not discovered for nearly a decade. The FBI’s analytical division under Robert King worked out, by 1991, that the agency’s losses could only be explained by a major penetration. The hunt narrowed, slowly, to a small group of officers with access. Ames was arrested on February 21, 1994. His wife, Rosario, received 63 months. He drew life imprisonment.
Robert Hanssen was a more careful traitor, and a more productive one for the KGB and SVR. A former FBI agent who had joined the bureau in 1976 and worked in Soviet counterintelligence, he began spying for the GRU in 1979 and switched to the KGB in 1985. He was a true-believer Cold Warrior of the darkest kind: he was motivated by money, but he also appears to have believed he was protecting America by feeding the Soviets what he considered unverified material. He passed thousands of pages of FBI documents over twenty-two years and was paid more than $1.4 million in cash and diamonds. He was arrested on February 18, 2001, at a dead drop in a park in Vienna, Virginia, after a long FBI surveillance operation. He, too, drew life imprisonment.
The Ames and Hanssen cases destroyed the American intelligence community’s confidence in its own personnel-security system. The two cases cost hundreds of millions of dollars to clean up, exposed the names of sources the United States had promised to protect, and accelerated the post-Cold War reforms that produced, eventually, the creation of the National Counterintelligence Executive and tighter financial-disclosure rules for cleared personnel.
Oleg Penkovsky and the Cuban Missile Crisis
Oleg Vladimirovich Penkovsky was a GRU colonel, a senior officer in the Soviet military’s foreign-intelligence directorate, who approached Western intelligence in 1960. He was recruited by MI6 and the CIA jointly, the only high-level Soviet intelligence officer to be so recruited during the Cold War. Over the course of 1961 and early 1962 he passed more than 5,000 pages of documents, including the texts of Soviet military regulations, Politburo records, and a detailed account of the operationally-deployed Soviet missile force.
Penkovsky’s intelligence was critical to the American response to the Cuban Missile Crisis in October 1962. The estimate of the Soviet strategic rocket force, which had been built partly on his information, gave the Kennedy administration confidence that the United States could absorb a Soviet first strike and still destroy the USSR — a calculation that made the choice of a naval “quarantine” rather than an air strike possible. His arrest in October 1962 (the Soviets had been tipped off by George Blake, a British traitor inside MI6, and by the FBI mole Robert Hanssen), trial in May 1963, and execution by firing squad in May 1964, brought to a close the most consequential espionage case of the early 1960s.
Key sources
- John Earl Haynes and Harvey Klehr, Spies: The Rise and Fall of the KGB in America (2009). The standard scholarly account of Soviet espionage in the United States, incorporating Venona and the post-1991 Russian releases.
- Christopher Andrew, The Defence of the Realm: The Authorized History of MI5 (2010). Essential for the Cambridge Five, Philby, and the British side of the Ames and Hanssen cases.
- Ronald Radosh and Joyce Milton, The Rosenberg File (1983, updated 1997). The most thorough documentary history of the Rosenberg case.
- Sergei Kostin and Eric Raynaud, Farewell: The Greatest Spy Story of the Twentieth Century (2011). The best account of the Penkovsky affair, based on Soviet and French sources.