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9th January 1937: Leon Trotsky (1879 - 1940) and his wife arrive in Tampico, Mexico, surrounded by plain clothes policemen, with his wife (behind left), and Mexican artists Frida Kahlo (1907 - 1954) and Diego Rivera, left. (Photo by Keystone/Getty Images)

9th January 1937: Leon Trotsky (1879 - 1940) and his wife arrive in Tampico, Mexico, surrounded by plain clothes policemen, with his wife (behind left), and Mexican artists Frida Kahlo (1907 - 1954) and Diego Rivera, left.   (Photo by Keystone/Getty Images)

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Leon Trotsky (1879 - 1940, second from left) and his wife Natalia Sedova (1882 - 1962) with Mexican painter Diego Rivera (1886 - 1957, far right) during the Trotskys' exile in Mexico City, circa 1938. (Photo by FPG/Archive Photos/Getty Images)

Leon Trotsky (1879 - 1940, second from left) and his wife Natalia Sedova (1882 - 1962) with Mexican painter Diego Rivera (1886 - 1957, far right) during the Trotskys' exile in Mexico City, circa 1938. (Photo by FPG/Archive Photos/Getty Images)

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Russian Marxist revolutionary Leon Trotsky (1879 - 1940, second from right) and his second wife, Natalia Sedova (1882 - 1962, far left), are greeted by Mexican painter Frida Kahlo (1907 - 1954) and Polish-born American Marxist theoretician and pro-union activist Max Shachtman (1904 - 1972) on their arrival in Tampico, Mexico, on board the the Norwegian tanker, Ruth, 9th January 1937. Trotsky, his wife and grandson have travelled to Mexico after being deported from Norway. (Photo by Fine Art Images/Heritage Images/Getty Images)

Russian Marxist revolutionary Leon Trotsky (1879 - 1940, second from right) and his second wife, Natalia Sedova (1882 - 1962, far left), are greeted by Mexican painter Frida Kahlo (1907 - 1954) and Polish-born American Marxist theoretician and pro-union activist Max Shachtman (1904 - 1972) on their arrival in Tampico, Mexico, on board the the Norwegian tanker, Ruth, 9th January 1937. Trotsky, his wife and grandson have travelled to Mexico after being deported from Norway. (Photo by Fine Art Images/Heritage Images/Getty Images)

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Frida Kahlo (1907 - 1954), Natalia Sedova (1882 - 1962) and Leon Trotsky (1879 - 1940) upon their arrival in Tampico, Mexico, 9th January 1937. Sedova is Trotsky's second wife. (Photo by Enrique Diaz/Galerie Bilderwelt/Getty Images)

Frida Kahlo (1907 - 1954), Natalia Sedova (1882 - 1962) and Leon Trotsky (1879 - 1940) upon their arrival in Tampico, Mexico, 9th January 1937. Sedova is Trotsky's second wife. (Photo by Enrique Diaz/Galerie Bilderwelt/Getty Images)