The Assassination of Leon Trotsky: The Final Blow in Stalin's Vendetta
Updated: Aug 20
On the afternoon of 20 August 1940, a man calling himself Frank Jacson walked into Leon Trotsky's study in Coyoacan, Mexico City, for the tenth time in a few months, carrying an article he wanted the old revolutionary's opinion on. Trotsky sat down to read it at his desk. Jacson, whose real name was Ramon Mercader, took a mountaineering ice axe from beneath his coat and drove the pointed end into the back of Trotsky's skull.
It didn't kill him instantly, and that single detail turned the assassination into something stranger and more revealing than a clean hit. Trotsky fought back, screamed and lived long enough to make sure his killer wasn't beaten to death before he could be questioned. The plot behind that moment had been years in the making, run by Soviet intelligence at Stalin's direct order, and it's a story with a lot more moving parts, and a lot more human wreckage, than the short version usually gets credit for.
Quick Answers
Who killed Leon Trotsky? Ramon Mercader, a Spanish communist and NKVD agent, killed Trotsky with an ice axe on 20 August 1940 at Trotsky's home in Coyoacan, Mexico City. Trotsky died from his injuries the following day.
Why did Stalin want Trotsky dead? Trotsky was Stalin's main rival for leadership of the Soviet Union after Lenin's death, and continued organising international opposition to Stalin's rule from exile. Stalin personally ordered his elimination through the NKVD in 1939.
What happened to Trotsky's assassin? Mercader served nearly 20 years in a Mexican prison without revealing his true identity. After his release in 1960, the Soviet Union awarded him the Order of Lenin and made him a Hero of the Soviet Union. He died in Cuba in 1978.
Bronstein Becomes Trotsky
He was born Lev Davidovich Bronstein in 1879 in Ukraine, the son of a reasonably prosperous Jewish farming family, and was drawn into revolutionary politics as a teenager. The czarist regime exiled him to Siberia twice for it, and he escaped both times, the second time using a forged passport on which he simply wrote down the name of one of his former prison guards. That borrowed name, Trotsky, stuck for the rest of his life and eventually eclipsed the one he was born with entirely.
In London he fell in with Vladimir Lenin, and by 1917 his organisational skill had become central to the Bolsheviks' takeover of the Russian Provisional Government. He built the Red Army more or less from nothing and led it to victory in the civil war that followed, and for a while it looked obvious that he'd inherit Lenin's position when the time came. He was a brilliant public speaker, an instinctive strategist, and a committed believer in permanent, international revolution rather than a Soviet Union content to sit still inside its own borders. When Lenin died in 1924, none of that was enough. Joseph Stalin, a far less impressive orator running the party's internal machinery from a much duller post, out-manoeuvred him instead.
The Split
The disagreement wasn't only personal, though it became bitterly personal soon enough. Trotsky's internationalism collided directly with Stalin's doctrine of socialism in one country, which argued for consolidating communism at home before exporting it anywhere else, and Trotsky made himself impossible to ignore by attacking Stalin's growing authoritarianism in public. Stalin responded by dismantling him piece by piece rather than all at once: expelled from the Communist Party and the Politburo in 1927, exiled internally to Kazakhstan in 1928, and stripped of Soviet citizenship and expelled from the country entirely in 1929. For most rivals that would have been the end of the story. For Stalin, a Trotsky who was merely gone wasn't the same as a Trotsky who was silenced, and the distinction would end up costing both of them everything.
The next decade was one long expulsion. Trotsky drifted through Turkey, France and Norway between 1929 and 1936, writing and organising against Stalin from whichever government would still tolerate him, and losing that toleration every few years as Soviet pressure caught up with him. In 1936 he finally settled in Mexico, at the invitation of the painter Diego Rivera and his wife Frida Kahlo, and the quiet suburb of Coyoacan became the closest thing to a permanent home he had left. He never mistook it for safety.
The Vendetta Reached His Children First
Before it ever reached Trotsky himself, Stalin's campaign had already worked its way through his family. His son Sergei Sedov, who'd stayed behind in the Soviet Union and deliberately avoided politics altogether, choosing a career as an engineer instead, was arrested anyway, accused of trying to poison factory workers, and executed by firing squad in 1937 simply for being his father's son. His other son, Lev Sedov, who'd followed his father into exile and ran much of the international opposition movement's day to day work from Paris, died in a Paris clinic in February 1938 after what was officially recorded as complications from a routine appendix operation, at 32. Trotskyists were convinced then, and plenty of historians still suspect now, that Soviet agents reached him even on the operating table, though it's never been definitively proven either way. By the time Ramon Mercader ever set foot in Coyoacan, Trotsky had already buried both of his sons and knew perfectly well what Stalin's patience actually looked like.
The Machine Gun Raid
He was right not to. Just after midnight on 24 May 1940, roughly twenty men dressed as police and soldiers talked their way past Trotsky's outer guard and stormed the compound, led by the Mexican muralist and committed Stalinist David Alfaro Siqueiros. They threw a bomb into the room where Trotsky's fourteen year old grandson, Vsevolod "Esteban" Volkov, was sleeping, and machine-gunned the bedroom where Trotsky and his wife Natalia Sedova had dropped to the floor moments earlier. Something over seventy rounds tore through their bed and the walls around it. When the raiders withdrew after roughly twenty minutes, Trotsky and Natalia were virtually untouched. Volkov had been grazed in the foot.
The one person who didn't walk away was Robert Sheldon Harte, a young American guard who'd been on duty at the gate that night and vanished with the raiders. His body turned up a month later, shot and buried in lime. Trotsky was certain Harte had been an innocent victim, murdered because he'd recognised his attackers, and had a plaque made for the house reading that he was murdered by Stalin. Other accounts, including a much later statement from the operation's own organiser, Leonid Eitingon, and Soviet cable decrypts made public decades afterwards, suggest Harte may have been a recruited NKVD asset who let the raiders in and was killed for getting cold feet partway through. Nobody has ever conclusively settled which version is true, and both readings still have serious defenders.
Two weeks later, Trotsky sat down and wrote an essay called Stalin Seeks My Death, laying out in plain terms why he believed a second attempt was not just likely but certain. He was right. Soviet intelligence gave the follow-up operation its own codename, Utka, Russian for Duck, and started building the man who'd actually carry it out.
Building an Assassin
The failure of the Siqueiros raid didn't slow Stalin down. According to Pavel Sudoplatov, the NKVD officer who ran the second, successful operation, he was personally taken to see Stalin in March 1939 alongside his chief, Lavrentiy Beria, and given a direct order: Trotsky was to be eliminated within the year. Sudoplatov handed the job to Leonid Eitingon, the same officer who'd organised the failed May raid and who was already believed to have overseen the earlier kidnapping and murder of the Spanish dissident Andreu Nin. This time the plan called for a single, patient assassin rather than a raiding party, and the man Eitingon chose was Ramon Mercader, a young Spanish communist and civil war veteran he already knew well through Mercader's mother.
Mercader's mother, Caridad, wasn't a bystander in any of this. Born into a wealthy Cuban-Spanish family, she'd abandoned a comfortable marriage for Marxism, fought in the Spanish Civil War, and become a genuine NKVD agent in her own right, reportedly Eitingon's lover as well as his colleague. She'd raised Ramon on the same politics, and when Eitingon needed someone Trotsky's circle would never suspect, Caridad's son, calm, well mannered and entirely unknown outside Spain, was the obvious choice.
Getting him into position took over a year of patient, deliberate fraud. In Paris in 1938, Mercader befriended Sylvia Ageloff, an American Trotskyist working close to Trotsky's own organisation, while posing as Jacques Mornard, the supposed son of a Belgian diplomat. When Ageloff returned to Brooklyn the following year, Mercader followed her under yet another invented identity, this time a Canadian businessman named Frank Jacson. The passport backing that identity had originally belonged to Tony Babich, a real Canadian volunteer in the Spanish Republican Army whose papers had been confiscated, almost certainly by Soviet handlers, after he was killed fighting Franco's forces. NKVD forgers swapped in Mercader's photograph and misspelled the surname slightly, Jackson to Jacson, and it held up under scrutiny for years. Through Ageloff, who insisted for the rest of her life that she'd had no idea what she was actually helping to build, Jacson worked his way into Trotsky's household as a trusted, unremarkable presence, driving her to and from the compound so often that the guards stopped paying him any real attention at all.
Ageloff's own account, that she was simply an unwitting dupe, was never seriously challenged in her lifetime, and she spent the next fifty five years as a Brooklyn social worker refusing every interview request about it. It's worth noting that account hasn't gone entirely unchallenged since. A handful of researchers digging through later testimony and FBI files have argued she understood a good deal more about Mercader's real activities than she ever admitted, even suggesting at points that she was directing him rather than the reverse. That version remains a minority position, pushed mainly by writers with their own stake in Trotskyist historiography, and it's never been proven. What's certain is that Ageloff walked away from the biggest political assassination of the twentieth century having convinced almost everyone, for the rest of her life, that she'd been nothing more than collateral damage in someone else's plot.
The Tenth Visit
By August 1940, Jacson had been inside Trotsky's compound often enough that nobody blinked when he turned up on the afternoon of the 20th. Trotsky was where he usually was at that hour, out in the patio feeding his rabbits and chickens, the closest thing to light exercise his confined, heavily guarded life allowed him. Jacson found him there and said he'd finished the article, an essay on the American Trotskyists James Burnham and Max Shachtman, and wanted his opinion on it before he and Sylvia left for New York the next day. Trotsky kept feeding the animals as they talked. He'd never much cared for Jacson, finding him faintly odd and more than a little dull, but he was too polite to say so outright.
Natalia spotted him first, from the balcony between the kitchen and the dining room, and something about him struck her as wrong straight away: a hat, and a raincoat pulled tight against his body despite the heat, which he explained away by asking her for a glass of water because he was thirsty. She walked him back to Trotsky at the rabbit hutches, then the two men went inside to the study together and she left them to it. She found it bizarre that anyone would wear a coat like that in the middle of a Mexican summer. She had no way of knowing what was sewn into the lining.
Once inside, Trotsky sat down at his desk to read. Jacson stood behind him, drew a mountaineering ice axe with its handle shortened out from under the coat, and swung it into the back of Trotsky's skull. The blow should have killed him outright. It didn't. He let out a scream that Joseph Hansen, working nearby on the compound's alarm system, later described as prolonged and agonised, half scream and half sob, a sound that dragged him to his feet before he even understood what had happened. Trotsky staggered to the study doorway, his face covered in blood, and when Natalia reached him he said only one word, calmly, almost matter of fact: Jackson. As if he was simply confirming it, and telling her it was over.
He still had enough left in him to fight. He grappled with Jacson long enough for the noise to bring guards running, and when they searched his attacker they found more than just the axe: a dagger sewn into a second pocket, a loaded pistol, $890 in cash and a prepared confession letter, plainly dictated in advance by his Soviet handlers, meant to be found on his body if he was killed trying to escape or shot on the spot. Whatever the plan had actually been, Jacson clearly hadn't expected to be taken alive. The guards began beating him with the butt of his own pistol. Bleeding heavily, Trotsky stopped them. Don't kill him, he said. He must talk.
Trotsky was rushed to hospital and operated on immediately. Doctors initially thought the wound wasn't especially serious, and for a short time it looked as though he might survive it. He told Hansen otherwise, pointing to his own chest: I feel, here, that this is the end, this time they've succeeded. He was right. He slipped into a coma the following day and died on the evening of 21 August 1940, without ever learning his attacker's real name.
Trotsky's office after he was attacked Blood stained floor of Trotsky's office Trotsky in the hospital The weapons used to attack Trotsky The body of Leon Trotsky
Twenty Years of Silence
Outside the compound, Caridad Mercader and Eitingon had been waiting in separate getaway cars. When Jacson failed to reappear, they abandoned him and fled Mexico entirely. He never saw either of them again in freedom.
Mexican police charged him under the only name he'd give them, Jacques Mornard, and it took years of investigation, cross-checked against Canadian immigration records and the Spanish government's own wartime casualty lists, to even confirm that Tony Babich's passport belonged to a dead man and that Jacson's real identity was something else entirely. Mercader served almost twenty years in a Mexican prison and never once broke, never named his handlers, and never publicly admitted who he was working for. He was released in 1960.
The Soviet Union had never officially admitted responsibility for any of it. Privately, it had never forgotten Mercader either. He travelled to Moscow after his release and in 1961 was awarded the Order of Lenin and made a Hero of the Soviet Union by Stalin's successor, Nikita Khrushchev, one of the state's highest honours, handed to a man most of the world still knew only as a convicted murderer. He spent the rest of his life shuttling between Cuba and the USSR, and came close to going home to Spain in 1977, when Communist Party leader Santiago Carrillo offered to help repatriate him on the condition that he write his memoirs and name every Soviet agent he'd known in Spain. Mercader refused. He died in Havana in 1978 and was buried in Moscow's Kuntsevo Cemetery under a false name, Ramon Ivanovich Lopez, one final alias for a man who'd spent his entire adult life wearing other people's identities.
What Was Left Behind
Trotsky's body was cremated, and his ashes were buried in the garden of the same Coyoacan house where he died, under a monument bearing a hammer and sickle. Natalia Sedova outlived him by more than two decades, spending most of them defending his legacy and continuing to fight, well into her seventies, for the formal rehabilitation of her husband and both the sons she'd already buried before him. She died in Paris in January 1962, aged 79, and her ashes were brought back to Coyoacan to rest beside his, the same garden, the same monument, the family finally reunited in the one place Stalin's reach had never quite managed to erase.
The house is a museum now, the study kept close to how it looked that afternoon, and the ice axe itself resurfaced decades later after passing quietly through private hands, eventually going on public display in Washington's International Spy Museum.
Stalin got what he wanted, but not cheaply. It had taken the Soviet state the better part of two decades, two separate assassination teams, a murdered American bystander, and a small army of forged identities to kill one exiled old man writing pamphlets from a fortified villa on the other side of the world. That's really the story underneath the story: not just how Stalin's enforcers finally caught up with him, but how far a dictatorship will go, and how long it will wait, to make sure a single dissenting voice never gets the last word.
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For the strange coincidence of where Trotsky was living in the years before all this began, read 1913: When Hitler, Trotsky, Tito, Freud and Stalin All Lived in the Same Place.
For the man who signed off on Trotsky's elimination, see Lavrentiy Beria: Stalin's Right-Hand Man.
Trotsky got a nod in this great song by The Stranglers
