Leon Trotsky ended up living in exile in Mexico City, where he was assassinated in 1940. Credit: Corbis /Getty

On the backwall in a garden in the borough of Mexico City is a plaque that reads ‘In Memory of Robert Sheldon Harte. 1915-1940. Murdered by Stalin’.
It is slightly hidden away from the house, not far from what was once the chicken coop. Or to be more precise, not far from Leon Trotsky’s chicken coop. For it is in Leon Trotsky’s garden that the plaque sits. And it is there that it caught my eye as I was moseying around the garden earlier this year.
The story of Robert Sheldon Harte is both deservedly forgotten and slightly suggestive. For Harte was not just a communist, he was an American communist — born in the US in 1915. A member of the Communist Party of the USA, he offered his services as a guard at the Trotsky household in Mexico at the age of 25. On 24 May, 1940, a GPU unit turned up at the house intending to kill Trotsky. The attempt failed, and so the unit settled with abducting Harte who was subsequently shot in the head and buried in quicklime in a shallow grave.
Since Harte’s death, there have been claims and counter-claims about exactly who he was working for. Was he merely an idealistic supporter of the exiled Trotsky or was he in fact — as some have claimed — a double agent, recruited by the NKVD and sent by Stalin’s agents to help in the assassination of the man he was purporting to protect? Whatever the answer, Trotsky himself believed that Harte had been loyal and had the plaque erected himself.
Though he wasn’t able to enjoy it for very long. For only a few months later – 80 years ago today, as it happens — Stalin’s agents were successful in their attempts to get Stalin’s greatest enemy. On August 21, 1940, agents of the NKVD managed to get into the Trotsky compound and one – Ramon Mercader – successfully killed Trotsky with an ice-pick while he was in his study.
There remains something not just gruesome but impressive about this act of political assassination. Impressive because of the message of strength it sent out. By the time of his assassination, Trotsky had been away from the Soviet Union for over a decade. He had eked out that time in a variety of comfortable and miserable surroundings, moving from Turkey to France, to Norway and eventually — not least thanks to the efforts of Frida Kahlo — to his final home of Mexico.
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